Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
prosthion is a noun meaning "craniometric point that is the most anterior point in the midline on the alveolar process of the maxilla". It carries one recorded sense.
craniometric point that is the most anterior point in the midline on the alveolar process of the maxilla
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 prosthion come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.