agar

/ˈeɪ.ɡɑː/

IPA: /EY1 G ER0/

noun
  1. 1

    A gelatinous material obtained from red algae, especially Gracilaria species, used as a bacterial culture medium, in electrophoresis and as a food additive.

  2. 2

    A culture medium based on this material.

Source: https://en.wiktionary.org/wiki/agar