Villi pl of villus

villose a. [L. villus, tuft of hair] Covered with villi.

villus n.; pl. villi [L. villus, tuft of hair] Soft flexible hairs. see microvillus.

vinculum n.; pl. -la [L. vinculum, anything used for binding] 1. Anything used to bond structures together. 2. (ARTHRO: Insecta) In male Lepidoptera, an U-shaped genital plate, dor-sally articulating with the pedunculus and midventrally forming a saccus. 3. (MOLL: Bivalvia) A shelly material between the basic dental structures of the shell.

vinous a. [L. vinum, wine] Wine-colored; vinaceous.

violaceous a. [L. viola, violet] Having a violet hue.

virescent a. [L. virescere, to grow green] Greenish or turning green.

virga n. [L. virga, rod] (ARTHRO: Insecta) In Dermaptera, a threadlike, sclerotized extension of the ejaculatory duct that guides the passage of the spermatophore into the spermatheca of the female virgalium n.; pl. -lia [L. virga, rod] (ECHINOD: Asteroidea) Ossicles lateral to and symmetrically placed on each side of the ambulacral ossicles.

virgate mastax (ROTIF) With fulcrum and manubrium in the shape of elongate rods; rami are triangular plates.

virgula organ (PLATY: Trematoda) Two pyriform sacs fused in the median line with forward pointed ends and placed near the posterior margin of the oral sucker.

virgulate cercaria (PLATY: Trematoda) A Xiphidiocercaria group with a ventral sucker smaller than the oral, tail without a fin and a virgula organ near the posterior margin of the oral sucker.

viridis a. [L. viridis, green] Green; greenish; viridescent.

virion n. [L. virus, poison] The mature virus.

virology n. [L. virus, poison; Gr. logos, discourse] The study of viruses.

virulence n. [L. virulentus, fr. virus, poison] The state of being pathogenic.

virus n. [L. virus, poison] An intracellular obligate, infectious parasitic agent visible only under the electron microscope, causing many diseases in man, animals and plants. viral a.

viscera n.pl. [L. viscera, entrails, flesh inside the body] Internal organs. visceral a.

visceral ganglion 1. (MOLL: Bivalvia) Ganglion found near the posterior adductor muscle in the posterior viscera. 2. (MOLL: Gastropoda) Unpaired, median ganglion lying posteriorly and ventrally to the gut; may be fused with other ganglia in advanced forms.

visceral hump or mass (MOLL) The main metabolic region of the body; contains the body organs; the visceropallium.

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