Mono

(noun) an acute disease characterized by fever and swollen lymph nodes and an abnormal increase of mononuclear leucocytes or monocytes in the bloodstream; not highly contagious; some believe it can be transmitted by kissing. Synonyms: infectious mononucleosis, mononucleosis, mono, glandular fever, kissing disease.

(adj) designating sound transmission or recording or reproduction over a single channel. Synonyms: mono, monophonic, single-channel.