roller

roller — noun

1. a long, round part inside a machine that rotates to press, flatten, carry, or sq

1.nounB2
Definition

a long, round part inside a machine that rotates to press, flatten, carry, or squeeze materials as they pass through the equipment.

Example

The mechanic cleaned the printer's rubber rollers with a soft cloth.

collocation: rubber rollers / printer rollers

Steel plates passed between heavy rollers at the factory and came out much thinner.

passive sense: material + pass between rollers

Common collocations
  • conveyor roller
  • printer roller
  • metal rollers
  • rubber rollers
  • adjust the rollers
  • clean the rollers
Synonyms
  • cylinder

    a general shape term; roller specifies that it rotates as part of a machine

  • drum

    a hollow cylinder that can hold or wind material, often larger than a roller

  • rotor

    a rotating part in a motor or engine; more technical and narrower in meaning

Usage Note

This sense is often used in compound nouns such as 'conveyor roller,' 'printer roller,' or 'paint roller' to specify the type of machine.

Common Mistakes

The roller on my bicycle is flat.
The tyre on my bicycle is flat.
A roller is a machine cylinder, not a wheel or tyre on a vehicle.

2. a small cylinder of plastic, foam, or metal that strands of hair are wound onto

2.nounB1
Definition

a small cylinder of plastic, foam, or metal that strands of hair are wound onto to create curls or waves, sometimes after being heated.

Example

Talia slept with rollers in her hair so she would have curls in the morning.

collocation: sleep with rollers in hair

The heated rollers gave Liam's straight hair a soft wave in under ten minutes.

collocation: heated rollers

Common collocations
  • heated rollers
  • foam rollers
  • Velcro rollers
  • put hair in rollers
  • remove the rollers
  • sleep in rollers
Synonyms
  • curler

    a shorter, everyday synonym; 'hair curler' is slightly more common in US English

  • curling iron

    a heated metal cylinder with a handle, held vertically rather than clipped into hair

Usage Note

Often modified by a material or feature: 'foam rollers,' 'heated rollers,' 'Velcro rollers.' The word 'curlers' is a common alternative.

3. a large, heavy vehicle with a wide metal drum at the front or rear that drives o

3.nounB2
Definition

a large, heavy vehicle with a wide metal drum at the front or rear that drives over newly laid surfaces to press them flat and smooth.

Example

Minho watched the steamroller flatten the fresh asphalt on the new road.

compound: steamroller (common synonym)

The heavy roller moved slowly across the construction site all morning.

collocation: heavy roller

Common collocations
  • steamroller
  • heavy roller
  • road roller
  • flatten asphalt
  • press the surface
  • construction site
Synonyms
  • steamroller

    an older term for a steam-powered roller; now used informally for any heavy road roller

  • compactor

    a broader term; compactors press waste or soil, while rollers specifically smooth surfaces

4. a very long ocean swell that builds in height as it travels toward the shore, of

4.nounB2
Definition

a very long ocean swell that builds in height as it travels toward the shore, often breaking with great force when it reaches shallow water.

Example

Saira stood on the cliff and watched the rollers crash against the rocks below.

collocation: rollers crash against [something]

The experienced surfer paddled hard to catch a massive roller before it broke.

Common collocations
  • powerful rollers
  • crash against
  • catch a roller
  • ride a roller
  • storm rollers
  • rollers rumbling
Synonyms
  • breaker

    a wave that breaks into foam, often at the shore; 'breaker' focuses on the moment of breaking

  • swell

    a long, unbroken wave out at sea; 'swell' implies less violent movement than 'roller'

  • surge

    a powerful forward movement of water, not necessarily forming a wave shape

Usage Note

Often used in the plural ('rollers') to describe a series of large waves arriving one after another. 'Roller' suggests size and power more than the general word 'wave.'

Common Mistakes

The surfer caught a roller.
The surfer caught a wave.
While technically possible, 'roller' emphasises the size and motion; most surfers use 'wave' in everyday conversation.

5. a brightly coloured bird found mainly in Africa, Europe, and Asia, known for tum

5.nounC1
Definition

a brightly coloured bird found mainly in Africa, Europe, and Asia, known for tumbling or rolling through the air as part of its courtship display.

Example

Ramón spotted a blue roller sitting on a telephone wire near the village.

collocation: blue roller / European roller (species name)

The roller's wings flashed bright blue and green as the bird dove through the air.

Common collocations
  • blue roller
  • European roller
  • lilac-breasted roller
  • roller bird
  • courtship display
  • rolling dive
Synonyms
  • coraciid

    the scientific family name; too technical for everyday use

Usage Note

Usually modified by a colour descriptor ('blue roller,' 'lilac-breasted roller') or a geographical prefix ('European roller,' 'Indian roller') to specify the species.

6. a domestic pigeon bred to perform backward rolls and flips during flight, a trai

6.nounC2
Definition

a domestic pigeon bred to perform backward rolls and flips during flight, a trait pigeon breeders call tumbling.

Example

Tariro keeps twenty rollers in a large loft behind the family house.

collocation: keep rollers / rollers in a loft

The roller flipped backward in midair, then spread its wings and steadied itself.

Common collocations
  • keep rollers
  • roller pigeon
  • roller loft
  • roller breed
  • roller competition
  • tumble in flight
Synonyms
  • tumbler pigeon

    a broader category that includes rollers; all rollers are tumblers, but not all tumblers roll continuously

  • Birmingham roller

    a specific breed of roller pigeon developed in England, famous for sustained backward rolling

Usage Note

Also called a 'tumbler' or 'tumbler pigeon.' The term 'roller' in this sense is used mainly by pigeon fanciers and is unlikely to appear in general conversation.

Word family

  • roll
    verbA2
  • roll
    nounB1
  • rolling
    adjectiveB2
  • rollable
    adjectiveC1

Synonym discussion

Sense: noun/1

All three words describe rotating mechanical parts, but they differ in shape and function. A 'cylinder' is a general geometric term for any tube-shaped object — it does not imply rotation or machine use. A 'drum' is a hollow cylinder that can hold or wind material, such as a cable drum or a washing machine drum; it is typically larger and broader than a roller. A 'rotor' is a rotating assembly inside an engine, motor, or pump that transfers mechanical energy; it has blades or vanes and is more technical. A 'roller,' by contrast, is specifically a smooth cylinder that presses, carries, or flattens materials as they move through a machine. For example, you would say 'the printer's roller feeds paper through' but 'the engine's rotor spins to generate power.'

cylinder ↗drum ↗rotor

Common collocations

Nouns

Adverbs

Phrases

  • roller coaster
  • roller skate
  • roller blind
  • roller shutter

Prepositions

Etymology

LatinFrenchEnglish

Formed in English by adding the agent suffix '-er' to the verb 'roll,' which came from Old French 'roler' (to roll), from Latin 'rotula' (a little wheel), a diminutive of 'rota' (wheel). The sense of a large wave dates from the 18th century, while the bird and pigeon meanings emerged in the 19th century, named for their rolling flight behaviour.