plural noun

: an order of algae (class Euglenophyceae) comprising those forms that have immobile cells with an encapsulating wall and that develop amorphous or dendroid colonies with sometimes temporary naked flagellate stages, the members of some of its genera (as Colacium) occurring on rotifers, copepods, and other minute aquatic animals

Word History


New Latin, from Colacium (from Greek kolak-, kolax parasite, flatterer + New Latin -ium) + -ales; perhaps akin to Greek kēlein to beguile

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Dictionary Entries Near Colaciales

Cite this Entry

“Colaciales.” Dictionary, Merriam-Webster, Accessed 25 Feb. 2024.

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