oceanography

(music) The octave that begins on the C that is two ledger lines below the staff of the bass clef

(music) The octave directly below the great octave.

plural of oca

Alternative spelling of reoccur

(linguistics) The part of Oceania comprising Polynesia, Micronesia and island Melanesia southeast of the Solomon Islands, including islands such as Vanuatu, Fiji, Tonga and Samoa.

(geology, oceanography) A hemispheric-scale long but narrow topographic depression of the seabed.

(nautical) Designed and equipped to be capable of sailing on an ocean.

A proposed common ancestor of the group of Oceanic languages.

(mycology, biology) A measuring instrument that is inserted into the eyepiece of a microscope, used to measure microscopic features.