The Collaborative International Dictionary
Crow-silk
Crow-silk \Crow"-silk`\ (kr?"s?lk`), n. (Bot.) A filamentous fresh-water alga ( Conferva rivularis of Linnaeus, Rhizoclonium rivulare of Kutzing).
Wiktionary
crow-silk
n. A filamentous freshwater alga ((taxlink Cladophora rivularis species noshow=1)).