from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An embryonic cell, in some insects, that develops into the heart
from The Century Dictionary and Cyclopedia
- n. In insect embryology, any one of a long row of cells bordering the mesodermal layer of the primitive band and affording the first indication of the dorsal vessel.
From cardio- + -blast (Wiktionary)