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AGAR
Agar (noun) — any culture medium that uses agar as the gelling agent. 2. (noun) a colloidal extract of algae; used especially in culture media and as a gelling agent in foods.
Agar is a valid 4-letter word worth 5 points in Scrabble (and Words With Friends letter values vary). Below are its anagrams and the shorter words hidden inside it.