vacuole:
intracellular cavity.
vagina:
duct in female reproductive system used to receive copulatory organ of male.
vas efferens:
duct in male reproductive system that carries spermatozoa away from each testis.
vas deferens:
duct in male reproductive system into which all vasa efferentia drain.
vector:
any agent that transmits a disease organism; also, general term given to blood feeding invertebrate host transmitting a parasite of vertebrates when the existence or location of sexual reproduction is unclear.
ventral gland:
glands on the ventral tegument of Notocotylidae, of uncertain function but suggested to be involved in respiration.
vertebrate host:
general term given to vertebrate host of a parasite when the existence or location of sexual reproduction is unclear.
vitellaria:
glands in Platyhelminthes that produce yolk-filled vitelline cells which are carried to the ootype and placed around the fertilized ovum.
vitelline duct:
a duct carrying vitelline cells from vitellaria to the ootype.
viviparous:
producing live offspring within the body of the parent.
vulva:
transverse slit in body wall of Nematoda and Acanthocephala through which female reproductive tract opens.