capillary tube

English Thesaurus

1. a tube of small internal diameter; holds liquid by capillary action (noun.artifact)

hypernym	:	tube, tubing,
definition	:	conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases (noun.artifact)

part meronym	:	thermometer,
definition	:	measuring instrument for measuring temperature (noun.artifact)