noun, plural tu·bi·fex·es, (especially collectively) tu·bi·fex.
any common, bottom-dwelling worm of the genus Tubifex, often used as food for aquarium fish.
Origin of tubifex
Also called red worm.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
noun plural -fex or -fexes
any small reddish freshwater oligochaete worm of the genus Tubifex; it characteristically lives in a tube in sand and is used as food for aquarium fish
Word Origin for tubifex
C19: from New Latin, from Latin tubus tube + facere to make, do
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012