agar

 
Pronunciation: /ˈeɪgɑː/
(also agar-agar /eɪgɑːrˈeɪgɑː/)

noun

[mass noun]
  • a gelatinous substance obtained from certain red seaweeds and used in biological culture media and as a thickener in foods.

Origin:

early 19th century: from Malay