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