Etymology
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Words related to O

oh (interj.)

interjection expressing various emotions (fear, surprise, pain, invocation, gladness, admiration, etc.), 1530s, from Middle English o, from Old French ô, oh or directly from Latin o, oh; a common Indo-European interjection (compare Greek ō; Old Church Slavonic and Lithuanian o; Irish och, Old Irish a; Sanskrit a). But it is not found in Old English (which had ea and translated Latin oh with la or eala) or the older Germanic languages except those that probably borrowed it from Greek or Latin.

The present tendency is to restrict oh to places where it has a certain independence, & prefer o where it is proclitic or leans forward upon what follows .... [Fowler]

Often extended for emphasis, as in Oh, baby, a stock saying from c. 1918; oh, boy (by 1917); oh, yeah (1924). Reduplicated form oh-oh as an expression of alarm or dismay is attested from 1944 (as uh-oh by 1935). Oh-so "so very" (often sarcastic or ironic) is by 1916. Oh yeah? "really? Is that so?" is attested from 1930.

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wino (n.)

1915, from wine + suffix as in bucko, kiddo.

ammo (n.)

1917, shortened form of ammunition.

combo (n.)

1929, U.S. slang, originally in entertainment (jazz groups, dance teams), short for combination, which was used by 1924 in the sense "small instrumental band."

kiddo (n.)

1893, familiar form of kid (n.) in the "child" sense.

cheapo (adj.)

"inexpensive, costing little," colloquial, 1967, from cheap (adj.) + -o (see O).

o'clock (adj.)

phrase preceded by one, two, three, etc., and signifying the time of day as shown by the face of a clock, c. 1720, an abbreviation of of the clock, from Middle English of the clokke (late 14c.). See O + clock (n.). The use of clock hand positions to describe vector directions or angles is from late 18c.

omega (n.)

final letter of the Greek alphabet, c. 1400, from Medieval Greek omega, from classical Greek o mega "big 'o' " (in contrast to o micron "little 'o' "); so called because the vowel was long in ancient Greek. From o + megas "great, large, vast, big, high, tall; mighty, important" (from PIE root *meg- "great"). Used figuratively for "the last, the final" of anything (as in Revelation i.8) from 1520s.

omicron (n.)

15th letter of the Greek alphabet, c. 1400, literally "small 'o,' " from o + Greek (s)mikros "small" (see micro-). So called because the vowel was "short" in ancient Greek. Compare omega.

primo 

1740 in music terms, "first, principal," from Italian primo "first, chief," from Latin primus "first" (see prime (adj.)). As slang for "excellent, first-class," perhaps an elaboration of prime (see O). Of drugs, by 1990s, street slang.