"capillary" in the noun sense
1. capillary, capillary tube, capillary tubing
a tube of small internal diameter holds liquid by capillary action
2. capillary, capillary vessel
any of the minute blood vessels connecting arterioles with venules
"capillary" in the adjective sense
of or relating to hair
2. capillary, hairlike
long and slender with a very small internal diameter
"a capillary tube"
Source: WordNet® (An amazing lexical database of English)
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