# symmetrical

### or symmetric

[si-me-tri-kuh l] /sɪˈmɛ trɪ kəl/
1.
characterized by or exhibiting symmetry; well-proportioned, as a body or whole; regular in form or arrangement of corresponding parts.
2.
Geometry.
1. 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.
2. noting a set consisting of pairs of points having this relation with respect to the same axis.
3. 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).
4. noting a set consisting of pairs of points having this relation with respect to the same center.
3.
Often, symmetric. Mathematics.
1. noting a square matrix that is equal to its transpose.
2. noting a dyad or dyadic that is equal to its conjugate.
3. noting a relation in which one element in relation to a second implies the second in relation to the first.
4.
Botany.
1. divisible into two similar parts by more than one plane passing through the center; actinomorphic.
2. (of a flower) having the same number of parts in each whorl.
5.
Chemistry.
1. having a structure that exhibits a regular repeated pattern of the component parts.
2. noting a benzene derivative in which three substitutions have occurred at alternate carbon atoms.
6.
affecting corresponding parts simultaneously, as certain diseases.
Origin of symmetrical
1745-1755
1745-55; symmetr(y) + -ical
Related forms
symmetricalness, noun
Synonyms
1. balanced, orderly, regular, congruent.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for unsymmetrical
Historical Examples
• unsymmetrical, un-si-met′ri-kal, adj. not symmetrical—also Unsymmet′ric.

• When leaves are unsymmetrical, like the begonias, the pattern is unsymmetrical also.

Alfred Tylor
• One of the difficulties attending this period is the tendency to unsymmetrical growth.

Margaret Warner Morley
• We have learnt to write "asymmetry," but not to avoid "unsymmetrical."

• Prophase of same mitosis, showing symmetrical and unsymmetrical pairs, as in figs. 178 and 179.

Nettie Maria Stevens
• unsymmetrical, that is, when the circles of the flower or some of them differ in the number of their members.

Asa Gray
• This leads to the difference between symmetrical and unsymmetrical metres.

Robert Gordon Latham
• Another scheme, proposed by Gravier, employed the unsymmetrical form shown in fig. 226.

Nehemiah Hawkins
• The increase in goods of different kinds is, of course, unsymmetrical.

John Bates Clark
• It is of rude unglazed earthenware, and is unsymmetrical, as represented here.

Daniel Wilson
British Dictionary definitions for unsymmetrical

## symmetrical

/sɪˈmɛtrɪkəl/
1.
possessing or displaying symmetry Compare asymmetric
2.
(maths)
1. (of two points) capable of being joined by a line that is bisected by a given point or bisected perpendicularly by a given line or plane: the points (x, y) and (–x, –y) are symmetrical about the origin
2. (of a configuration) having pairs of points that are symmetrical about a given point, line, or plane: a circle is symmetrical about a diameter
3. (of an equation or function of two or more variables) remaining unchanged in form after an interchange of two variables: x + y = z is a symmetrical equation
3.
(chem) (of a compound) having a molecular structure in which substituents are symmetrical about the molecule
4.
(botany) another word for isomerous
5.
Also symmetric. (of a disease, infection, etc) affecting both sides of the body or corresponding parts, such as both legs
Derived Forms
symmetricalness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for unsymmetrical

## symmetrical

1570s (implied in symmetrically), from symmetry + -ical.

Online Etymology Dictionary, © 2010 Douglas Harper
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### Difficulty index for symmetrical

Few English speakers likely know this word

### Word Value for unsymmetrical

0
27
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