mono-
- one, alone, single: monocracy
- containing one atom or one chemical group: monohydric
- having a thickness of one molecule: monolayer
See mono- in American Heritage Dictionary 4
or mon-
prefix- One; single; alone: monomorphic.
- Containing a single atom, radical, or group: monobasic.
- Monomolecular; monatomic: monolayer.
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