Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
cns is a noun meaning "the portion of the vertebrate nervous system consisting of the brain and spinal cord". It carries one recorded sense.
the portion of the vertebrate nervous system consisting of the brain and spinal cord
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for cns come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.