Definition from Wiktionary, the free dictionary
- 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.
- For a clearer exmple, 192.168.1.35 and 192.168.1.252 are both valid addresses in the CIDR block 192.168.1.0/24, but 10.11.1.1 is not.
- Controlled Internal Drug Release; technology for the controlled release of a hormone or drug, for example as used to release progesterone in beef cattle.