Uterus masculinus: a pouch or sac into which the ductus ejaculatorius opens in the Symphyla.
Utriculi breviores: small vesicular sacs connected with the seminal vesicles in crickets and some other insects.
Utriculi majores: large vesicular sacs or tubular structures connected with the seminal vesicles in crickets and some other insects.
Utriculus: a little bag or hollow vesicle.
Vacuolate: with vacuoles or small cavities, empty or filled with a watery fluid.
Vagina: the tubular structure formed by the union of the oviducts in the female, opening externally to admit the passage of the egg to the ovipositor: receives the penis of the male in copulation and is sometimes called oviduct: "every part, the office of which is to cover, protect or defend the tongue": "the bivalve coriaceous sheath or cover of the spicula": generally, a sheath.
Vaginata: sheathed: an obsolete ordinal term for Coleoptera.
Vaginate: inclosed in a bivalved sheath.
Vagus: sympathetic nervous system; q.v.