Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ibero-mesornis is a noun meaning "sparrow-sized fossil bird of the Cretaceous period having a vestigial tail; found in Spain; considered possibly the third most primitive of all birds". It carries one recorded sense.
sparrow-sized fossil bird of the Cretaceous period having a vestigial tail; found in Spain; considered possibly the third most primitive of all birds
Definitions, synonyms and semantic relations for ibero-mesornis come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.