Pro thyalosoma

·noun The investing portion, or spherical envelope, surrounding the eccentric germinal spot of the germinal vesicle.

pro
prō (archaic collat. form, posi in posimerium; cf. pono, from posino; cf. Gr. ποτί and ποτ with πρ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
pro
prō (1) adv., see prout. ...

An Elementary Latin Dictionary
Pro
·adj A Latin preposition signifying for, before, forth. II. Pro ·adv For, on, or in behalf of, the ...

Webster's Dictionary of the English Language
Pro-
·- A prefix signifying before, in front, forth, for, in behalf of, in place of, according to; as, pr...

Webster's Dictionary of the English Language
Pro rata
·- In proportion; proportionately; according to the share, interest, or liability of each. ...

Webster's Dictionary of the English Language
pro-slavery
In favor of slavery. An expression much used by political speakers and writers, although not yet ins...

Dictionary of American Words And Phrases by John Russell Bartlett.