ˌkär(ˌ)benə̇ˈsilə̇n noun
( -s )
Etymology: car b- + ben zyl + pen icillin
: a broad-spectrum semisynthetic penicillin C 17 H 18 N 2 O 6 S that is effective against gram-negative bacteria (as pseudomonas) and that acts especially by inhibiting cell-wall synthesis