apotome

腹板前部(缨尾目铗尾科), 腹板背部

发音

US /əˈpɒtəmi/

词形变化

apotomes 复数 apotomes

释义与例句

n.
  1. 1.

    The difference between two quantities or lengths commensurable only in power, as between 1 and the square root of 2, or between the diagonal and side of a square.

    数学

    2014, Jacques Sesiano (translator), Liber Mahameleth, Part Two: Translation, Glossary, [12th c, Anonymous (possibly John of Seville), Liber Mahameleth], Springer, page 767, If some number and the root of the root of a number are multiplied by the corresponding apotome, the result will be an apotome.

  2. 2.

    The remaining part of a whole tone after a minor second has been deducted from it; an augmented unison. Most commonly used to refer to the Pythagorean chromatic semitone, which has a ratio of 2187/2048.

    音乐

    1813, Music, article in John Mason Good, Olinthus Gregory, Newton Bosworth, Pantologia: A New Cyclopaedia, Volume 8: MID—OZO, unnumbered page, This semitone was termed by the Pythagoreans apotome, and the diatonic semitone was termed limma. They contended, that the apotome, or distance from B flat to B natural, was larger than the limma, or distance from A to B flat.

  3. 3.

    A distinct division of an insect which is divided from the other divisions by a pinch point.

    生物 动物学

词源

Borrowing from Ancient Greek ἀποτομή (apotomḗ, “cutting off”). The musical sense originates from the Pythagorean tradition. The mathematical sense is attested in Euclid's Elements (Book X, proposition 73, et seq.).

来源：wiktionary