Cohort: In a clinical research trial, a group of study participants or patients.
- Cohort study
Cohort study: A study in which a particular outcome, such as death from a heart attack, is compared in groups of people who are alike in most ways but differ by a certain characteristic, such as smoking. See also: Cohort.
Coinsurance: A provision by which the insured individual shares in the cost of certain expenses. The same as co-payment.
Coitophobia: An abnormal and persistent fear of sexual intercourse. Sufferers from coitophobia experience undue anxiety because they are preoccupied with failing in some way while having sexual intercourse. Among the symptoms of coitophobia are failure to achieve an erection (erectile dysfunction) and failure to achieve orgasm (anorgasmy). “Coitophobia” is a hybrid word derived from the […]
- Coitus interruptus
Coitus interruptus: A method of contraception, also called withdrawal, in which the man withdraws his penis from the vagina before ejaculation. Fertilization is prevented because the sperm do not enter the vagina. The effectiveness of this maneuver depends on the man’s ability to withdraw before the ejaculation of any sperm. Withdrawal does not provide protection […]
Street name for cocaine, the most potent stimulant of natural origin, a bitter addictive anesthetic (pain blocker) which is extracted from the leaves of the coca scrub (Erythroxylon coca) indigenous to the Andean highlands of South America. From the name of the plant came the name cocaine and its street name coke (and Coke as […]