Vaccine: Modified disease virus used to stimulate resistance to that disease. Development of a cancer vaccine is currently a subject of intense research.
Vagina : Passage leading from the vulva to the uterus in women.
Vector: See cloning vector.
Virus: Noncellular biological entity that can reproduce only within a host cell. Viruses cause infections and are too small to be seen with regular microscopes. They consist of nucleic acid covered by protein; some animal viruses are also surrounded by membrane. Inside the infected cell, the virus uses the synthetic capability of the host to produce progeny ("children") virus.
VLSI: Very large scale integration allowing more than 100,000 transistors on a chip.
