-blast
1.
variant of
blasto-
as final element of a compound word:
ectoblast.
British Dictionary definitions for
-blast
-blast
combining form
1.
(in biology) indicating an embryonic cell or formative layer:
mesoblast
Word Origin
from Greek
blastos
bud
-blast
in Medicine
-blast
suff.
An immature, embryonic stage in the development of cells or tissues:
erythroblast.