(pharmacology) A crystalline nonhygroscopic acid that is a semisynthetic form of penicillin, used in the form of its sodium or potassium salt C₁₆H₁₇KN₂O₅S, and has antibacterial action similar to benzylpenicillin and is more resistant to inactivation by gastric acids; 6-phenoxyacetamidopenicillanic acid, C₁₇H₂₀N₂O₆S.

simple past tense and past participle of penicillinize

Third-person singular simple present indicative form of penicillinize

present participle of penicillinize

(transitive, medicine) To treat (someone) with penicillin. / (transitive, medicine) To add penicillin to (an erythrocyte etc.).