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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
chorioallantois is a noun meaning "the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois". It carries one recorded sense.
the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois
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 chorioallantois come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.