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The Collaborative International Dictionary
Mon-

Mono- \Mon"o-\, Mon- \Mon-\ [Gr. ?.] A prefix signifying one, single, alone; as, monocarp, monopoly; (Chem.) indicating that a compound contains one atom, one radical, or one group of that to the name of which it is united; as, monoxide, monosulphide, monatomic, etc.

Mon-

Mon- \Mon-\ Same as Mono-.

Wiktionary
mon-

pre. (alternative form of mono- English)