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
Examples of agar in a Sentence
Recent Examples on the Web
In lab tests, Petri dishes containing Penicillin-PPG-doped agar were inoculated with E. coli bacteria, then half of each dish was covered with a light-blocking aluminum sticker.
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Ben Coxworth, New Atlas, 13 June 2025
Add tomato juice to a small sauce pan and bring to boil, add agar agar and reduce heat stirring constantly.
—Claudia Alarcón, Forbes.com, 30 May 2025
The agar provides all the moisture and nutrients the growing plants need.
—Dr. Matthew Lisy, Hartford Courant, 1 Feb. 2025
Add agar gelatin and glucose mix to the chocolate and allow to cool for 30 minutes.
—Angelica Stabile, Fox News, 16 Dec. 2024
See All Example Sentences for agar
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Ben Coxworth, New Atlas, 13 June 2025
Add tomato juice to a small sauce pan and bring to boil, add agar agar and reduce heat stirring constantly.
—Claudia Alarcón, Forbes.com, 30 May 2025
The agar provides all the moisture and nutrients the growing plants need.
—Dr. Matthew Lisy, Hartford Courant, 1 Feb. 2025
Add agar gelatin and glucose mix to the chocolate and allow to cool for 30 minutes.
—Angelica Stabile, Fox News, 16 Dec. 2024
See All Example Sentences for agar
Cite this Entry
“Agar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/agar. Accessed 3 Nov. 2025.
Copy CitationKids Definition
agar
noun
variants
also agar-agar
ˈäg-ə-ˈräg-ər
1
: a jellylike substance obtained from a red alga and used especially in culture media or to give firmness to foods
2
: a culture medium containing agar
Medical Definition
agar
noun1
: 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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