Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
fontanel is a noun meaning "any membranous gap between the bones of the cranium in an infant or fetus". It carries one recorded sense.
any membranous gap between the bones of the cranium in an infant or fetus
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 fontanel come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.