| 单词 | symmetrical |
| 释义 | symmetrical —symmetrically, adv. —symmetricalness, n. /si me"tri keuhl/, adj. 1. characterized by or exhibiting symmetry; well-proportioned, as a body or whole; regular in form or arrangement of corresponding parts. 2. Geom. a. noting two points in a plane such that the line segment joining the points is bisected by an axis: Points (1, 1) and (1, -1) are symmetrical with respect to the x-axis. b. noting a set consisting of pairs of points having this relation with respect to the same axis. c. noting two points in a plane such that the line segment joining the points is bisected by a point or center: The points (1, 1) and (-1, -1) are symmetrical with respect to (0, 0). d. noting a set consisting of pairs of points having this relation with respect to the same center. 3. Often, symmetric. Math. a. noting a square matrix that is equal to its transpose. b. noting a dyad or dyadic that is equal to its conjugate. c. noting a relation in which one element in relation to a second implies the second in relation to the first. 4. Bot. a. divisible into two similar parts by more than one plane passing through the center; actinomorphic. b. (of a flower) having the same number of parts in each whorl. 5. Chem. a. having a structure that exhibits a regular repeated pattern of the component parts. b. noting a benzene derivative in which three substitutions have occurred at alternate carbon atoms. 6. affecting corresponding parts simultaneously, as certain diseases. Also, symmetric. [1745-55; SYMMETR(Y) + -ICAL] Syn. 1. balanced, orderly, regular, congruent. |
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