Per″i‐blast (?), a. [Gr. � to grow around. See Peri-, and -blast.] (Biol.) The protoplasmic matter which surrounds the entoblast, or cell nucleus, and undergoes segmentation. — Per′i‐blas″tic, a.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.