| 释义 |
‖ limaçon|limasɔ̃|
Also 6 li-, lymasson.
[Fr. = shell-snail, spiral staircase, snail-wheel, etc., f. limace (see limace).]
†1. A kind of military manœuvre. [So in OFr.]
1581Styward Mart. Discipl. i. 68 You shall bring them in this proportion of a ring, otherwise called a limasson. 1591Garrard's Art Warre 207 To the end they may assure themselues the better, it is necessarie they make Lymassons when they are in simple and single aray.
2. (See quot.; some Dicts. give the sense as Eng.)
1839Penny Cycl. XIV. 315/2 The Univalve Shells, as they were then [1757] called, or as Adanson denominates them, the Limaçons.
3. Math. (See quot. 1877.)
1874Sylvester in Proc. Roy. Instit. VII. 186 note, The Limaçon of Pascal. 1877Cayley in Encycl. Brit. VI. 723/1 A form which presents itself is when two ovals, one inside the other, unite, so as to give rise to a crunode—in default of a better name this may be called, after the curve of that name, a limaçon. 1879Salmon Higher Plane Curves (ed. 3) 44 In like manner on the radius vector to a fixed circle from a fixed point on it a portion of fixed length is taken on either side of the circle. The curve is called Pascal's limaçon.
4. A metallic gimp (Funk's Stand. Dict. 1893). |