| 释义 |
polyhedral, a.|pɒlɪˈhiːdrəl, -ˈhɛdrəl|
Also polyedral.
[f. Gr. πολύεδρος (Plut.) (f. πολυ-, poly- + ἕδρα base, side of a solid figure) + -al1.]
1. Of the form of a polyhedron; having many faces or sides, as a solid figure or body.
1811Pinkerton Petralogy I. 324 A granular serpentine,..which..splits in small polyhedral fragments. 1845Todd & Bowman Phys. Anat. I. 81 The fat vesicles..assume a polyhedral figure more or less regular. 1885G. L. Goodale Physiol. Bot. (1892) 47 Starch..occurs as minute..polyhedral granules.
2. Pertaining or relating to a polyhedron; in Higher Algebra applied to a class of functions.
1880Cayley Coll. Math. Papers XI. 183 The functions so transformable into themselves must be Polyhedral functions..the linear transformations..corresponding to the rotations whereby the spherical polyhedron can be brought into coincidence with its own original position.
3. Of an angle: Formed by three or more planes meeting at a point. (Usually called a solid angle.) Cf. dihedral.
1864in Webster.
4. polyhedral disease = polyhedrosis.
1913Jrnl. Econ. Entomol. VI. 482 In Europe there is a tendency to group all the caterpillar diseases which are characterized by the formation of polyhedral bodies under the name of ‘polyederkrankheit’ or polyhedral diseases. 1971Indian Jrnl. Entomol. XXXIII. 111 (heading) Investigations on the nuclear polyhedrosis of Prodenia litura Fabricius: 1. Nature of the polyhedral disease. |