femur n. [L. femur, thigh] 1. (ARTHRO: Chelicerata) a. In spiders, the thigh; normally the stoutest segment, articulating to the body through the trochanter and coxa and bearing the patella and remaining leg segments at the distal end. b. In mites, segment of palp and legs, between the tro-chanter and genu; sometimes divided into femur 1 (proximal) and femur 2 (distal). 2. (ARTHRO: Insecta) The largest and stoutest part of the leg of most adults; the third segment, located between the trochanter and the tibia.
fenestra n.; pl. -trae [L. fenestra, window] 1. A small opening; a window. 2. An opening through a shell; a foramen. 3. (ARTHRO: Insecta) a. Transparent spots or marks on the wings. b. In Orthoptera, a small membranous area at the base of an antennae of a cockroach. c. In Isoptera, a cavity on the head; a fontanel. d. The membranous base of the ommatidia at the junction with the optic nerve of a compound eye; a transparent ocellate spot in an eye. e. In male Odonata, the genital opening on the ventral surface of abdominal segment 11. see fontanelle. 4. (BRYO: Gymnol-aemata) In Cheilostomata, an open space or mesh in reticulate zoaria. 5. (NEMATA) a. In Secernentea, the thin membranous area surrounding or on either side of the vulva of a cyst forming nematode (Heterodera spp.). b. In some marine Adenophorea, the openings in subcuticular helmets through which sensory nerves pass. fenestrate a., fenestration n.
fenestrate colony (BRYO) An erect colony in which the branches form a reticulate pattern.
fenestrella n. [L. dim. fenestra, window] (ARTHRO: Insecta) In Orthoptera, a transparent spot in the anal area of the anterior wings. see fenestra.
fenestrule n. [L. dim. fenestra, window] (BRYO) A small opening between branches of a fenestrate colony.
fente n. [F. fente, a hole] (MOLL: Bivalvia) An opening or slit near the hinges when the valves are closed.
feral a. [L. ferus, wild, untamed] Undomesticated; wild; uncultivated.
ferment see enzyme fermentation chambers (ARTHRO: Insecta) A tube or pouch in the hind gut where food materials are broken down by various bacteria or protozoa.
ferreous a. [L. ferreus, of iron] The color metallic gray resembling polished iron.
ferruginous a. [L. ferrugineus, like iron rust] Rusty red-brown in color.
ferrule n. [L. dim. viria, bracelet] (NEMATA) A ring or bushing making a tight joint between the odontostyle and odonto-phore.
fertile a. [L. fertilis, fruitful] Producing viable gametes, capable of producing viable eggs or living offspring. fertility n.
fertilization n. [L. fertilis, fruitful] Fusion of two gametes, especially of their nuclei, to produce a zygote.
fertilization cone Protuberance on an ovum where the spermatozoon fuses with the ovum.
fertilization membrane A delicate membrane that grows outward from the point of contact of the egg and spermatozoon and rapidly covers the surface of the egg.
fertilizin n. [L. fertilis, fruitful] A chemical causing species specific attachment of spermatozoon to ovum.
festivus a. [L. festivus, holiday, feast] Having a variety of colors.
festoon n. [F. feston, garland] Garlands hanging in curves.
festoons n.pl. [F. feston, garland] (ARTHRO: Chelicerata) Sclerites on the posterior margin of the opisthosoma of certain hard ticks.
fetid a. [L. fetidus, stinking] Having a disagreeable odor; malodorous.
fiber n. [L. fibra, thread] 1. Any thread-like structure. 2. (PO-RIF) A column more homogeneous than a tract.
fiber layers (NEMATA) Cuticular strata of dense connective-like tissue that is oblique, ribbonlike, possibly spiral (mesocuti-cle).
fibril n.; pl. -llae [L. dim. of fibra, thread] Small fibers or threads within cells.
fibrillar layer (NEMATA) In ascarids, a cuticular stratum that consists of a condensation of spongy matrix forming a closely woven network between the internal cortical layer and the matrix layer.
fibrin n. [L. fibra, thread] A fibrous protein that constitutes muscular tissue and facilitates blood clotting or coagulation.
fibrinogen n. [L. fibra, thread; gigno, producing] A protein substance of the blood and other body fluids facilitating the production of fibrin.
fibrocyte n. [L. fibra, thread; Gr. kytos, container] Elongated cells derived from connective tissue cells, the fibroblasts, functioning in the production of fibrous tissue.
fibroin n. [L. fibra, thread] (ARTHRO) 1. A protein found in silk and webs. 2. (ARTHRO: Insecta) In Bombyx, a unique protein containing an unusual amount of the simpler amino acids glycine and alanine.
fibroplasm n. [L. fibra, thread; Gr. plasma, molded] (NEMATA) That portion of a muscle cell differentiated into contractile fibers. see sarcoplasm.
fibrous ligament (MOLL: Bivalvia) The fibrous part of a ligament in which the conchiolin is impregnated with calcium carbonate; elastic to compression.
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