mon-

Multiple Entries:
  mon-    mono-  

Concise Oxford English Dictionary © 2008 Oxford University Press:
mon-

▶combining form variant spelling of mono- shortened before a vowel (as in monamine).

Concise Oxford English Dictionary © 2008 Oxford University Press:
mono- /ˈmɒnəʊ/ (also mon- before a vowel)

▶combining form

• 1 one; alone; single: monocoque.

• 2 Chemistry (forming names of compounds) containing one atom or group of a specified kind: monoamine.

– origin from Gk monos ‘alone’.