CIDR

C3I1D2R1
/ˈsaɪ.dɚ//ˈsaɪː.dɚ/

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.

Less commonScrabble 7
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Meanings

proper noun
  1. abbreviationacronymAcronym 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.

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

Rhymes & wordplay

Rhymes with CIDR

readerleaderinsidercedarspiderridercidersliderglideroutsidersniderliedereiderhiderdeciderpleaderoutriderstridorchiderderiderhang gliderheederloss leadernonrider
All rhymes →

Sounds the same

cider (one pronunciation)cider (one pronunciation)
Cite this entry
APA

CIDR. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/CIDR

MLA

“CIDR.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/CIDR. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “CIDR,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/CIDR.

Source: CIDR on Wiktionary, CC BY-SA 4.0.