Fimbriate: a margin or process when set with a fringe of hair closely placed.
Finger: of maxilla, is the digitus, q.v.
First clypeus: see post clypeus.
First inner apical nervure: in Hymenoptera (Nort.); is cubitus 1, from media 4, to first anal (Comst.).
First lateral suture: Odonata; starts from beneath base of front wing behind humeral suture and meets it behind second coxa.
First longitudinal vein: in Diptera; - radius 1 (Comst.).
First submarginal cross-nervure: Hymenoptera; part of the media and the radio-medial cross vein (Comst.).
Fissate: divided or split: with fissures or cracks.
Fissile -is: cleft or divided; as the wings in plume-moths: also used for lamellate.
Fissiparous: applied to that form of asexual generation in which the parent divides; each part becoming a new individual.