agar

noun

ˈä-gər 

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

The agar provides all the moisture and nutrients the growing plants need. —Dr. Matthew Lisy, Hartford Courant, 1 Feb. 2025

Combine gelatine in water with glucose and agar in a separate small pan. —Angelica Stabile, Fox News, 16 Dec. 2024

Add agar gelatin and glucose mix to the chocolate and allow to cool for 30 minutes. —Angelica Stabile, Fox News, 16 Dec. 2024

Fish swimming in a melting river of agar and red bean jellies. —Caroline Newton, Bon Appétit, 12 Dec. 2024

Word History

Etymology

short for Malay agar-agar, name for the red alga from which it is extracted

First Known Use

1885, in the meaning defined at sense 1

Phrases Containing agar

• agar-agar
• agar plate

Rhymes for agar

• gager
• jager
• sager
• vaguer

Kids Definition

agar

noun

ˈäg-ər 

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

noun

ˈäg-ər 

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