Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
dioestrual is an adjective meaning "(of animals that have several estrous cycles in one breeding season) in a period of sexual inactivity". It carries one recorded sense.
(of animals that have several estrous cycles in one breeding season) in a period of sexual inactivity
Definitions, synonyms and semantic relations for dioestrual come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.