PARABLAST
Etymology
Noun
parablast (plural parablasts)
(biology) A portion of the mesoblast (of peripheral origin) of the developing embryo, whose cells are involved in the formation of the first blood and blood vessels.
Source: Wiktionary
Par"a*blast, n. Etym: [Cf. Gr. Para-, and -blast.] (Biol.)
Definition: A portion of the mesoblast (of peripheral origin) of the
developing embryo, the cells of which are especially concerned in
forming the first blood and blood vessels. C. S. Minot.
Source: Webster’s Unabridged Dictionary 1913 Edition