plural of O-level

plural of o-face

plural of will-o'-wisp

Shaped like the capital letter "O", circular.

Alternative form of OS / (calendar systems) Abbreviation of old style.

Abbreviation of overdrive.

Appended to titles of (often fictional) machines, especially to suggest that the verb to which the suffix is appended is its primary function.

Alternative form of O.C.

plural of o-word

Any word beginning with o that is not normally taboo but is considered (often humorously) to be so in the given context.