Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
vermis is a noun meaning "the narrow central part of the cerebellum between the two hemispheres". It carries one recorded sense.
the narrow central part of the cerebellum between the two hemispheres
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 vermis come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.