brachiation

brachiation

[brey-kee-ey-shuhn, brak-ee-]
noun Zoology.
locomotion accomplished by swinging by the arms from one hold to another.

Origin:
brachiate + -ion

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Collins
World English Dictionary
brachiate
 
adj
1.  botany having widely divergent paired branches
 
vb
2.  (intr) (of some arboreal apes and monkeys) to swing by the arms from one hold to the next
 
[C19: from Latin bracchiātus with armlike branches]
 
brachi'ation
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
brachiation   (brā'kē-ā'shən, brāk'ē-)  Pronunciation Key 
Movement in which the suspended body swings by the arms from one hold to another, as in gibbons and arboreal primates. Adaptations used in brachiation, such as relatively long arms and a freely rotating shoulder joint, may have contributed to the development of bipedalism in protohumans.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

brachiation

in animal behaviour, specialized form of arboreal locomotion in which movement is accomplished by swinging from one hold to another by the arms. The process is highly developed in the gibbon and siamang, which are anatomically adapted for it in the length of their forelimbs, their long hooklike fingers, and the mobility of their shoulder joints. The South American spider monkey, considered a semibrachiator, uses its prehensile tail as a third arm. Spider monkeys both run along branches and swing from them.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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