One of the mysteries of the English language finally explained.
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.
Mid 19th century (in an earlier sense). From para- + -blast; in sense 1 after either German Parablast or scientific Latin parablasta.
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