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ominous
omission
omit
omitted dividend
OMM
Ommiad
omni-
omnibus
omnicompetent
omnidirectional
omnidirectional radio range
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-on (1)

-on


suffix 
Definition:
 
1. subatomic particle
fermion

2. chemical substance
fenuron

3. fundamental hereditary unit
muton

4. unit, quantum
chronon

5. inert gas
radon

[<ion, influenced by the Greek neuter present participle on "being" or neuter noun ending -on]
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