walking on the whole sole of the foot, as humans, and bears.
a plantigrade animal.

1825–35; < Neo-Latin plantigradus, equivalent to Latin plant(a) sole + -i- -i- + -gradus -grade

subplantigrade, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plantigrade (ˈplæntɪˌɡreɪd)
1.  walking with the entire sole of the foot touching the ground, as, for example, man and bears
2.  a plantigrade animal
[C19: via French from New Latin plantigradus, from Latin planta sole of the foot + gradus a step]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

plantigrade plan·ti·grade (plān'tĭ-grād')
Walking with the entire sole on the ground, as humans do.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
plantigrade   (plān'tĭ-grād')  Pronunciation Key 
Walking with the entire sole of the foot on the ground, as humans, bears, raccoons, and rabbits.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Several treatment schedules in these test conditions killed veliger and plantigrade stages of the zebra mussels.
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