Divided into four parts by deep clefts; specifically (of any of the hairs lining the inside of a bladder in a bladderwort) having four arms. Sometimes written 4-fid.
A structure with four divisions or branches; specifically (in a bladderwort) a four-armed hair.
Mid 17th century; earliest use found in Robert Lovell (?1630–1690), naturalist. From classical Latin quadrifidus split into four from quadri- + -fidus.