ˈprōd.əˌblast noun
Etymology: International Scientific Vocabulary prot- + -blast; probably originally formed in German
1. : a naked cell without a cell wall
2. : a blastomere of the segmenting egg that is the parent cell of a definite part or organ
• pro·to·blas·tic | ̷ ̷ ̷ ̷|blastik adjective