| Word | Definitions | Synonyms |
|---|---|---|
| altazimuth | (noun) an instrument that measures the altitude and azimuth of celestial bodies; used in navigation | - |
| azimuth | (noun) the azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian | Synonyms: AZ |
| bismuth | (noun) a heavy brittle diamagnetic trivalent metallic element (resembles arsenic and antimony chemically); usually recovered as a by-product from ores of other metals | Synonyms: atomic number 83, Bi |