| 释义 |
apotome|əˈpɒtəmiː|
Also -tomy.
[a. Gr. ἀποτοµή a cutting off, f. ἀπο-τέµν-ειν to cut off.]
1. Math. The difference of two quantities, commensurable only in power (i.e. in their squares, cubes, etc.; see Euclid Bk. X); e.g. the difference between √ 2 and 1, which is the difference between the diagonal and side of a square.
1571Digges Geom. Pract. iv. i. T iij b, √ 180 - 6..deducted from 12, leueth this Apotome 18 - √ 180. 1656Blount Glossogr., Apotomy. 1673Wallis in Rigaud Corr. Sci. Men II. 567 Of which binomial and apotome, the cubic roots are to be extracted. 1706in Phillips. 1796Hutton Math. Dict. s.v., The doctrine of apotomes, in lines, as delivered by Euclid in the tenth book.
2. Mus. (See quot.)
1696in Phillips. 1753Chambers Cycl. Supp., Apotome, in music, is the difference of the tone major and Limma, expressed by 2187/2048. 1806J. W. Callcott Mus. Gram. ii. iii. 112 This Semitone was termed by the Pythagoreans Apotome. |