(organic chemistry) Describing any heterocycle having one or more oxygen atoms in the ring

(organic chemistry) A derivative of cephem in which an oxygen atom has been substituted for sulfur; the basis for a group of antibiotics

(pharmacology) A narrow-spectrum beta-lactam antibiotic made by chemical modification of penicillin and administered in the form of its hydrated sodium salt C₁₉H₁₈N₃NaO₅S·H₂O to treat infections caused by penicillin-resistant staphylococci.

(organic chemistry) Describing a bicyclic compound having a bridging oxygen atom.

A particular kind of anti-inflammatory drug that is used to treat osteoarthritis.

(organic chemistry) Any of several isomeric seven-membered, unsaturated heterocycles containing four carbon atoms, two nitrogen atoms, one oxygen atoms and three double bonds

(organic chemistry, especially in combination) Any univalent radical derived from an oxadiazole

Archaic form of oxyacid.

plural of oxacid

An antidepressant and anxiolytic drug.