methicillin
Concise Oxford English Dictionary © 2008 Oxford University Press:
methicillin /ˌmɛθɪˈsɪlɪn/
▶noun Medicine a semi-synthetic form of penicillin.
– origin 1960s: from meth(yl) and (pen)icillin.
'methicillin' also found in these Oxford entries:

