any culture medium that uses agar as the gelling agent
"The microbiologist carefully poured the sterile agar into the Petri dish to prepare it for bacterial growth."
A gelatinous material obtained from red algae, especially Gracilaria species, used as a bacterial culture medium, in electrophoresis and as a food additive.
"The lab technician added agar to the petri dish to create a solid surface for growing the bacteria cultures."
A surname.
"During the family reunion, Cousin Maria introduced her husband's brother, who is also an Agar and shares their great-grandfather's name."