pen·i·cil·lin·ase 
(pĕn′ĭ-sĭlĭ-nās′)
(pĕn′ĭ-sĭlĭ-nās′)n.
Any of several beta-lactamase enzymes that cleave the beta-lactam ring in penicillins. Penicillinases are found in many penicillin-resistant bacteria.
- discomfortingly
- discommend
- discommendable
- discommode
- discompose
- discomposedly
- discomposure
- disconcert
- disconcertingly
- disconformity
- disconnect
- disconnected
- disconnectedly
- disconnectedness
- disconnection
- disconsolate
- disconsolately
- disconsolation
- discontent
- discontented
- discontentedly
- discontentedness
- discontentment
- discontinuance
- discontinuation