Frumentaceous Definition
fro͝omən-tāshəs, -mĕn-
adjective
Of, having the nature of, or like wheat or other grain.
Webster's New World
Origin of Frumentaceous
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From Late Latin frumentaceus, from Latin frumentum, grain, from the root of frux meaning fruit.
From Wiktionary
From Late Latin frūmentāceus from Latin frūmentum grain
From American Heritage Dictionary of the English Language, 5th Edition