capillary tube

Noun
  1. A tube of small internal diameter;
    Holds liquid by capillary action (synset 102959505)
    is a type of: tube, tubing - conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
    is a part of: thermometer - measuring instrument for measuring temperature
    same as: capillary, capillary tubing

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