(business) Of or related to an industry lacking competition.

(music) An interval whose frequency ratio is not 2:1 (that of the octave), but is perceived or treated as equivalent to this ratio, and whose pitches are considered equivalent to each other as with octave equivalency.

plural of occupation bridge

(engineering) A bridge connecting the parts of an estate separated by a road, railway, or canal.

Synonym of tramp steamer

plural of octave clef

(music) a symbol showing that the pitch of a note is to be raised by one or two octaves.

A line drawn as a part of the construction of a geometrical figure or problem, but not to appear in the finished plan.

plural of occult line

(medicine) Initialism of optical coherence tomography: an optical signal acquisition and processing method that captures high-resolution three-dimensional images from biological tissues.