cidr

Acronym of Classless Inter-Domain Routing, normally an IP address notation such as 192.168.1.0/24 indicating a block of addresses; the number after the slash indicates how many bits are in the mask; bits to the right are not masked.

192.168.1.35 and 192.168.1.252 are both valid addresses in the CIDR block 192.168.1.0/24, but 192.168.2.35 is not.

Initialism of controlled internal drug release (“technology for the controlled release of a hormone or drug, for example to release progesterone in beef cattle”).