Definition of agar
1
: a gelatinous colloidal extract of a red alga (as of the genera Gelidium, Gracilaria, and Eucheuma) used especially in culture media or as a gelling and stabilizing agent in foods
2
: a culture medium containing agar
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Merriam-Webster unabridged
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Time Traveler for agar
The first known use of agar was in 1885
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