‖ periblastulaEmbryol.|pɛrɪˈblæstjuːlə| [mod.L., f. peri- + blastula.] The blastula arising from a periblastic ovum. 1876Lankester in Q. Jrnl.Microsc.Sc. XVI. 63 In such cases the fertilised egg passes at once to the Periblastula stage, and cannot be said to exhibit either a Peri-monerula or Peri-cytula, or Peri-morula stage.