The backbone of the CIDR is a nylon spine covered by a progesterone (1.38 g) impregnated silicone skin. During the seven days in the vagina the CIDR releases a relatively constant dosage of progesterone. Upon removal of the insert, progesterone is quickly eliminated.
variant. an organism or tissue that is different from the majority of the population but is still sufficiently similar to the common mode to be considered to be one of them, e.g. a variant strain of classical swine fever (hog cholera) virus. 1  Facebook.
Definition of 'variant'. variant (veÉriÉnt ) A variant of a particular thing is something that has a different form to that thing, although it is related to it. The quagga was a strikingly beautiful variant of the zebra. An intriguing variant to pipelines would be to carry the water using the existing system of canals.