/mez'leuh sil"in/ , n. Pharm.
a wide-spectrum semisynthetic penicillin, C 21 H 25 N 5 O 8 S 2 , used parenterally in the treatment of infections due to Pseudomonas aeruginosa.
[ ME(THYL) + (IMIDA)ZOL(E) (rearranged), components of the chemical name + (PENI)CILLIN ]