didymo

noun
did·​y·​mo | \ˈdi-də-ˌmō, -dē-\

Definition of didymo 

: a freshwater, microscopic diatom (Didymosphenia geminata) typically of cool, nutrient-poor waters of Canada and the northern U.S. and Europe that has become invasive in warmer waters where it forms large, thick brown, yellow, or whitish mats attached to a submerged substrate (such as a rock or plant) All visitors, especially boaters and fishermen, are being encouraged to wash their gear in an effort to avoid spreading didymo.— Sean Sauro … the unpleasant and unwanted freshwater algae, Didymophenia geminata, commonly called didymo, or, with absolutely no trace of affection, rock snot.— James Gorman

called also rock snot

First Known Use of didymo

2005, in the meaning defined above

History and Etymology for didymo

short for New Latin Didymosphenia, genus name (earlier, name for a subgenus of Gomphonema), from Greek dídymos "double," (in plural) "twins" + -o- -o- + sphḗn "wedge" (of obscure origin) + -ia -ia entry 1; so named for the symmetrical wedge-like nodes at each end of the raphe — more at didymium

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Dictionary Entries near didymo

didy

didym-

didymium

didymo

didymolite

didymous

Didynamia

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The first known use of didymo was in 2005

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