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"capillary" is also used as a crossword clue. If that's what you saw, the answer is often hairlike (8 letters).
Definitions
long and slender with a very small internal diameter
Word origin
From Latin capillāris (“pertaining to the hair”), from capillus (“the hair, properly of the head”), from caput (“head”).
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Tiny blood vessel”9 letters
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