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Ontologies
- noun - (computer science) a rigorous and exhaustive organization of some knowledge domain that is usually hierarchical and contains all the relevant entities and their relations
- the metaphysical study of the nature of being and existence
Ontologist
- - One who is versed in or treats of ontology.
Opacifying
- verb - become opaque; "the tissue in the eye's cornea may opacify and the patient may go blind"
- make opaque; "The glass was opacified more greater privacy"
Opalescing
- verb - exhibit a play of colors like that of an opal; "This nitrate opalesces under certain conditions"
- reflect light or colors like an opal; "Distant clouds opalesce like pale brocade"; "raindrops caught in a sunbeam seem to opalesce"
Operettist
- unknown - A writer, composer, or performer of operettas.
Ophicleide
- - A large brass wind instrument, formerly used in the orchestra and in military bands, having a loud tone, deep pitch, and a compass of three octaves; -- now generally supplanted by bass and contrabass tubas. It developed from the older wooden instrument called the serpent.
Opinionist
- - One fond of his own notions, or unduly attached to his own opinions.
Oppilation
- - The act of filling or crowding together; a stopping by redundant matter; obstruction, particularly in the lower intestines.