# vas

/vˈæs/ (UK) · CEFR C2 · Noun

Source: https://englishreference.com/word/vas
Updated: 2026-08-15

## Definition

a small tube or vessel in the body that carries fluids, especially one that carries sperm. It is a technical term used in biology and medicine.

For teachers: a vessel or duct that conveys bodily fluids, most commonly referring to the ductus deferens in the male reproductive system. Often appears in the plural form 'vasa'.

## Examples

- The surgeon carefully identified the vas during the procedure.
- A vasectomy involves cutting and sealing the vas deferens to prevent sperm from entering the urethra.
- In anatomical studies, the vas deferens is distinguished from other ducts by its thick muscular walls, which facilitate the rapid transport of sperm during ejaculation.

## Usage notes

- The plural form is 'vasa'. In medical contexts, it is almost always followed by a specific descriptor like 'deferens' or 'afferens'.

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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.