bilateral symmetry


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symmetry

 [sim´ĕ-tre]
correspondence in size, form, and arrangement of parts on opposite sides of a plane, or around an axis. adj., adj symmet´rical.
bilateral symmetry the configuration of an irregularly shaped body (such as the human body or that of higher animals) that can be divided by a longitudinal plane into halves that are mirror images of each other.
radial symmetry that in which the body parts are arranged regularly around a central axis.

bilateral symmetry

n.
Symmetrical arrangement, as of an organism or a body part, along a central axis, so that the body is divided into equivalent right and left halves by only one plane.

bilateral symmetry

Etymology: L, bis + latus, side; Gk, syn, together, metron, measure
similar structure of the halves of an organism.

bilateral symmetry

adjective Referring to a form divisible into equal mirror halves in one plane only—e.g., the right half of an organism mirrors the left.

bilateral symmetry

adjective Referring to a form divisible into equal mirror halves in one plane only

bilateral symmetry

an animal body structure in which there is a head and a rear with the body organs arranged so that a section through the midline from dorsal (upper) to ventral (lower) surfaces would divide the organism into almost identical right and left halves. Most higher invertebrates (e.g. PLATYHELMINTHS, ANNELIDS, ARTHROPODS) and all vertebrates are bilaterally symmetrical. Compare RADIAL SYMMETRY.

symmetry

correspondence in size, form and arrangement of parts on opposite sides of a plane, or around an axis. Often used to describe conformation.

bilateral symmetry
the configuration of an irregularly shaped body (such as the body of a higher animal) that can be divided by a longitudinal plane into halves that are mirror images of each other.
radial symmetry
that in which the body parts are arranged regularly around a central axis.
References in periodicals archive ?
Plants and organic molecules do not invest in bilateral symmetry the way animals do, but they produce many phenomena of interest because of the possibility of enantiomorphic pairs--three-dimensional shapes like the left and right hand which are mirror images of each other but which cannot be rotated to fit in the same space as each other.
Bilateral symmetry does make an axis visible, and axes are inherently hierarchical, but they are widespread in architecture and hardly to be avoided.
The symmetry coefficients computed in this study were used to evaluate bilateral symmetry for joint angles, moments, and powers over the whole gait cycle.
Double Cloak of Stars (all works 2009), with its bilateral symmetry, two head holes resembling "eyes," and arrays of painted feathers that double as tears, suggests a simplified face; the hanging garment is accompanied by two matching black hoods and a tall, carved walnut pole that leans against the wall.
Developmental stressors, such as pathogenic infection, genetic homozygosity and environmental trauma, can result in deviations from perfect bilateral symmetry that are known as fluctuating asymmetries (Mealey et al.
Symmetrical balance: a type of symmetry in which the parts on either side of a center line are exactly (math) or nearly the same (art); also called mirror, reflectional, or bilateral symmetry.
Like the bilateral symmetry of a pair of hands, Yehoahim and Batya are a perfect match.

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