Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
petalless is an adjective meaning "(of flowers) having no petals". It carries one recorded sense.
(of flowers) having no petals
Definitions, synonyms and semantic relations for petalless come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .