(chemistry) Any compound, of general formula R-CO-NH-CO-NH₂ or R-CO-NH-CO-NH-CO-R', formally derived by the acylation of urea.

(biochemistry) The removal of intermediate metabolites, especially in the citric acid cycle, to prevent their accumulation in the mitochondrial matrix.

A compound of this type. / (chiefly in the plural) A petroleum fraction containing no aromatic compounds

A large wasp (Pompilus formosus) that captures the Texan tarantula (Mygale hentzii) and places it in its nest as food for its young, after paralyzing it by a sting.