| 单词 | director-plane |
| 释义 | > as lemmasdirector-plane director-plane n. a fixed plane used in describing a surface, analogous to the line called a directrix n. ΚΠ 1864 Webster's Amer. Dict. Eng. Lang. Directer plane. 1867 R. Townsend in Q. Jrnl. Math. VIII. 11 The director plane of the paraboloid. 1876 Catal. Special Loan Coll. Sci. Apparatus S. Kensington Mus. §99 The director planes..of these conoïds are at right angles to one another. < as lemmas |
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