Axis of symmetry
Symmetry Sym"me*try, n. [L. symmetria, Gr. ?; sy`n with, together + ? a measure: cf. F. sym['e]trie. See {Syn-}, and {Meter} rhythm.] 1. A due proportion of the several parts of a body to each other; adaptation of the form or dimensions of the several parts of a thing to each other; the union and conformity of the members of a work to the whole. [1913 Webster]

2. (Biol.) The law of likeness; similarity of structure; regularity in form and arrangement; orderly and similar distribution of parts, such that an animal may be divided into parts which are structurally symmetrical. [1913 Webster]

Note: Bilateral symmetry, or two-sidedness, in vertebrates, etc., is that in which the body can be divided into symmetrical halves by a vertical plane passing through the middle; radial symmetry, as in echinoderms, is that in which the individual parts are arranged symmetrically around a central axis; serial symmetry, or zonal symmetry, as in earthworms, is that in which the segments or metameres of the body are disposed in a zonal manner one after the other in a longitudinal axis. This last is sometimes called metamerism. [1913 Webster]

3. (Bot.) (a) Equality in the number of parts of the successive circles in a flower. (b) Likeness in the form and size of floral organs of the same kind; regularity. [1913 Webster]

{Axis of symmetry}. (Geom.) See under {Axis}.

{Respective symmetry}, that disposition of parts in which only the opposite sides are equal to each other. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

### Look at other dictionaries:

• Axis of symmetry — Axis Ax is, n.; pl. {Axes}. [L. axis axis, axle. See {Axle}.] A straight line, real or imaginary, passing through a body, on which it revolves, or may be supposed to revolve; a line passing through a body or system around which the parts are… …   The Collaborative International Dictionary of English

• axis of symmetry — simetrijos ašis statusas T sritis fizika atitikmenys: angl. axis of symmetry; symmetry axis vok. Symmetrieachse, f rus. ось симметрии, f pranc. axe de symétrie, m …   Fizikos terminų žodynas

• axis of symmetry — noun see axis …   New Collegiate Dictionary

• axis of symmetry — 1. Math. a straight line for which every point on a given curve has corresponding to it another point such that the line connecting the two points is bisected by the given line. 2. Crystall. See rotation axis. [1875 80] * * * …   Universalium

• axis of symmetry — the line about which a geometrical figure or drawing is symmetric * * * 1. Math. a straight line for which every point on a given curve has corresponding to it another point such that the line connecting the two points is bisected by the given… …   Useful english dictionary

• axis of symmetry — noun Any of one or more lines about which a geometric figure is symmetric …   Wiktionary

• axis of symmetry — Смотри ось симметрии …   Энциклопедический словарь по металлургии

• axis of symmetry — imaginary line which divides a figure into two equal parts …   English contemporary dictionary

• axis of symmetry — noun Mathematics a straight line for which every point on a given curve has corresponding to it another point such that the line connecting the two points is bisected by the given line …   Australian English dictionary

• screw axis of symmetry — sraigtinė simetrijos ašis statusas T sritis fizika atitikmenys: angl. screw axis of symmetry vok. Symmetrieschraubenachse, f rus. винтовая ось симметрии, f pranc. axe de symétrie hélicoïdal, m …   Fizikos terminų žodynas