(nautical) Initialism of ore-bulk-oil: designating a ship designed to be capable of carrying wet or dry cargoes.

(commerce) or best offer; showing that a price is negotiable.

Alternative form of on behalf of

A soprano and melody wind instrument in the modern orchestra and wind ensemble. It is a smaller instrument and generally made of grenadilla wood. It is a member of the double reed family.

plural of oboe

Alternative form of ovoo (“Mongolian cairn”)

(colloquial) Alternative letter-case form of OBO: or best offer

An instrument of the oboe family, pitched in A below middle C.

(rare) Synonym of oboeist

plural of oboe-player