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Also, agar-agar. Also called Chinese gelatin, Chinese isinglass, Japanese gelatin, Japanese isinglass. a gelatinlike product of certain seaweeds, used for solidifying certain culture media, as a thickening agent for ice cream and other foods, as a substitute for gelatin, in adhesives, as an emulsifier, etc.
Biology. a culture medium having an agar base.
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Contemporary Examples

It is a mega-leap from the agar and test-tube finding to real patients and their delicate lungs.
Big Tobacco, Not MRSA, Is the Real Problem With E-Cigarettes Kent Sepkowitz May 19, 2014

Historical Examples

First of all, will you please telephone Mr. agar and Mr. Pitts.
The Little Lady of the Big House Jack London

I coughed, and agar, who had taken my arm-chair, wanted to give it me back.
My Double Life Sarah Bernhardt

Dora knew of the ancient horror of such a necessity, handed down from one agar to another, like a family tradition.
From One Generation to Another Henry Seton Merriman

On leaving my two friends I drove straight to agar’s to tell her what had happened.
My Double Life Sarah Bernhardt

agar smiled, although he was conscious of a vague feeling of discomfort.
From One Generation to Another Henry Seton Merriman

Weigh out French maltose, 40 grammes, and dissolve in the agar.
The Elements of Bacteriological Technique John William Henry Eyre

She held her parasol a little lower, so that Mrs. agar could not see her face.
From One Generation to Another Henry Seton Merriman

Pour plates from the agar tubes; label, and incubate at 37° C.
The Elements of Bacteriological Technique John William Henry Eyre

The other two persons to whom the secret was to be imparted were Mrs. agar and Dora Glynde.
From One Generation to Another Henry Seton Merriman

noun
a complex gelatinous carbohydrate obtained from seaweeds, esp those of the genus Gelidium, used as a culture medium for bacteria, a laxative, in food such as ice cream as a thickening agent (E406), etc Also called agar-agar

agar a·gar (ā’gär’, ä’gär’) or a·gar-a·gar (ā’gär-ā’gär’, ä’gär-ä’-)
n.

A gelatinous material derived from marine algae, used as a base for bacterial culture media and as a stabilizer and thickener in food.

A culture medium containing this material.

agar
(ā’gär’, ä’gär’)
A gelatinous material obtained from marine algae, especially seaweed, used as a medium for growing bacterial cultures in the laboratory and as a thickener and stabilizer in food products.