Princeton's WordNet

1. agar, nutrient agar(noun)

   any culture medium that uses agar as the gelling agent

2. agar, agar-agar(noun)

   a colloidal extract of algae; used especially in culture media and as a gelling agent in foods

Wiktionary

1. agar(Noun)

   A gelatinous material obtained from the marine algae, used as a bacterial culture medium, in electrophoresis and as a food additive.

2. agar(Noun)

   An agarose, the principle constituent of the commercial gel.

Origin: From agar-agar meaning jelly.

U.S. National Library of Medicine

1. Agar

   A complex sulfated polymer of galactose units, extracted from Gelidium cartilagineum, Gracilaria confervoides, and related red algae. It is used as a gel in the preparation of solid culture media for microorganisms, as a bulk laxative, in making emulsions, and as a supporting medium for immunodiffusion and immunoelectrophoresis.

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