# bitumen

/ˌbaɪˈtumən/ (US) · /bˈɪtʃuːmən/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/bitumen
Updated: 2026-05-20

## Definition

a thick, sticky black substance used to make roads and waterproof surfaces. It is a natural material that is very hard to melt.

For teachers: a thick, sticky, black or brown viscous liquid or semi-solid form of petroleum. It is primarily used as a binder in asphalt for road construction and as a waterproofing agent.

## Examples

- The workers applied a layer of bitumen to the roof.
- Engineers tested the bitumen to ensure it could withstand the extreme heat of the desert summer.
- The chemical structure of bitumen allows it to bind aggregate materials together, creating a durable surface that can endure heavy traffic and environmental stress.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.