'Ibero-mesornis' definitions:
Definition of 'Ibero-mesornis'
From: WordNet
noun
Sparrow-sized fossil bird of the Cretaceous period having a vestigial tail; found in Spain; considered possibly the third most primitive of all birds
Definition of 'Ibero-mesornis'
From: GCIDE
- Ibero-mesornis \Ibero-mesornis\ n. A sparrow-sized fossil bird of the Lower Cretaceous having a strutlike pectoral bone and vestigial tail; found in Spain; considered possibly the third most primitive of all birds. [WordNet 1.5]