parablast
/ˈparəblɑːst/ /ˈparəblast/noun
Embryology. Especially in the terminology of W. His: a layer of cells that gives rise to the blood vessels and connective tissue of the embryo (embryonic mesenchyme), (supposedly) located outside the blastoderm. Now historical.
Origin
Mid 19th century (in an earlier sense). From para- + -blast; in sense 1 after either German Parablast or scientific Latin parablasta.