The Collaborative International Dictionary
Perichaetous
Perichaetous \Per`i*ch[ae]"tous\, a. [See Perich[ae]tium.] (Zo["o]l.) Surrounded by set[ae]; -- said of certain earthworms (genus Perich[ae]tus).
Wiktionary
perichaetous
a. (context zoology English) Surrounded by setae; said of certain earthworms (genus (taxlink Perichaetus genus)).