• (n.) The bony cranium, as distinguished from the cartilaginous cranium.
(os″te-o-kra´ne-әm) the fetal skull during the period of ossification, from early in the third month of gestation.
Os`te·o·cra'ni·um noun [ Osteo- + cranium .] (Anat.) The bony cranium, as distinguished from the cartilaginous cranium. 
Type: Term Pronunciation: os′tē-ō-krā′nē-ŭm Definitions: 1. The cranium of the fetus after ossification of the membranous cranium has made it firm.
The skull of the fetus after ossification has begun.
osteocranium 1. The bony cranium, as distinguished from the cartilaginous cranium. 2. The fetal skull during the period of ossification, from early in the third month of gestation. 3. The cranium of the fetus after ossification of the membranous cranium has made it firm.