This one surprised even me, as I had never come across the term before.
Mucopus: mucus (fyi: this is the noun; mucous is the adjective, as in mucous membrane... this is something I was confused about) mixed with pus; mucopurulent discharge.
Apparently there is also a heavy metal band by this name, as I found out when I googled the term. Not very attractive. The band or the term.