bi·ped·al

[bahy-ped-l, -pi-dl, bahy-ped-l]
adjective

Origin:
1600–10; bi-1 + pedal (adj.)

bi·ped·al·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To bipedal
Etymonline
Word Origin & History

bipedal
c.1600, from biped + -al (1). Classical L. bipedalis meant "two feet long or thick." Bipedalism is recorded from 1907.
Online Etymology Dictionary, © 2010 Douglas Harper
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00:10
Bipedal is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a chattering or flighty, light-headed person.
American Heritage
Science Dictionary
biped   (bī'pěd')  Pronunciation Key 
An animal having two feet, such as a bird or human.

bipedal adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Whether it is bipedal locomotion from that of quadruped, cooking food for
  easier digestion what is involved is saving energy.
Instead of a regular bipedal gait, the robot has two sets of two legs, in inner
  and outer pairs.
What initially separated them and us from other primates was habitual erect,
  bipedal locomotion.
We humans shouldn't feel too bad that ostriches are our bipedal betters.
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