|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|preventive (prɪˈvɛntɪv, prɪˈvɛntətɪv)|
|1.||tending or intended to prevent or hinder|
|a. tending to prevent disease; prophylactic|
|b. of or relating to the branch of medicine concerned with prolonging life and preventing disease|
|3.||(in Britain) of, relating to, or belonging to the customs and excise service or the coastguard|
|4.||something that serves to prevent or hinder|
|5.||med any drug or agent that tends to prevent or protect against disease|
|6.||another name for contraceptive|
preventive pre·ven·tive (prĭ-věn'tĭv) or pre·ven·ta·tive (-tə-tĭv)
Preventing or slowing the course of an illness or a disease; prophylactic. n.
A preventive agent or treatment.