"ducts" in the noun sense
1. duct, epithelial duct, canal, channel
a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
"the tear duct was obstructed"
"the alimentary canal"
"poison is released through a channel in the snake's fangs"
a continuous tube formed by a row of elongated cells lacking intervening end walls
an enclosed conduit for a fluid
Source: WordNet® (An amazing lexical database of English)
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