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-blast

variant of blasto- as final element of a compound word: ectoblast.

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins

World English Dictionary

-blast

—*n combining form*
	(in biology) indicating an embryonic cell or formative layer: mesoblast

[from Greek blastos bud]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage

Medical Dictionary

-blast suff.
An immature, embryonic stage in the development of cells or tissues: erythroblast.