Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
semilunar is an adjective meaning "resembling the new moon in shape". It carries one recorded sense.
resembling the new moon in shape
Definitions, synonyms and semantic relations for semilunar come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.