Plural of agar; gelatinous substances extracted from seaweed used in cooking and laboratories.
From Malay 'agar-agar,' meaning 'jelly.' Adopted into English through trade routes in Southeast Asia.
Agar is invisible in modern life but everywhere—it's in desserts, gelatin capsules, petri dishes for bacterial culture, and even in some cosmetics; one seaweed product changed food science, medicine, and microbiology simultaneously.
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