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Definition of agar

agar

/ˈɑː.ɡɚ/
a · gar
Plural:agars
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agar Lexical Profile

agar Game Scores & Validity

• noun

1

A gelatinous substance obtained from the cell walls of various red algae, widely used as a solidifying medium for culturing bacteria and fungi in microbiology laboratories.

Example

"The lab technician streaked the bacterial sample across a Petri dish filled with nutrient agar."

2

A plant-based gelling agent derived from red seaweed, used in cooking, baking, and confectionery as a vegetarian substitute for gelatin and as a thickener for soups, jellies, and ice cream.

Example

"Because several guests were vegan, the pastry chef set the fruit tart with agar instead of gelatin."

Synonyms
View all synonyms for agar

• Rhymes for agar

• Nearby Words

agamid
agapanthus
agape
agar
agate
agave
age

Word Origin & Etymology

Borrowed in the early 19th century from Malay 'agar-agar', the local name for certain species of red algae and the edible jelly extracted from them.

Cite this Entry

Wordmom. (2026). Definition of Agar. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/agar
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