Entry 1 sense Webster, 1913 Ovoviviparous /ōvˌ-ōvˌ-īvˌ-ĭp'-ẽr-əs/ · O·vo·vi·vip·a·rous · IPA /ˌoʊvoʊvɪˈvɪpəɹəs/ 01 a. Oviparous, but hatching the egg while it is within the body, as some fishes and reptiles. 1. Oviparous, but hatching the egg while it is within the body, as some fishes and reptiles.(Biol.)