ag·a·roid | \ˈa-gə-ˌrȯid\
plural -s

Definition of agaroid 

: a substance similar to agar in properties that is obtained from certain red algae (as of the genus Phyllophora)

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First Known Use of agaroid

1943, in the meaning defined above

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The first known use of agaroid was in 1943

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