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Oman, Gulf of
omasum
Omayyad
OMB
ombre
ombrogenous
ombudsman
ombudsperson
ombudswoman
Omdurman
-ome
omega
omega-3
omega-6 oil
omega hyperon
omega meson
omega minus
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omicron

om·i·cron [ ómi kròn, ṓmi kròn ] (plural om·i·crons)


noun 
Definition:
 
15th letter of Greek alphabet: the 15th letter of the Greek alphabet, represented in the English alphabet as "o"

[Mid-17th century. < Greek o mikron "small (i.e., short) o," as opposed to ō mega (see omega)]
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