11 letters · 15 points in Scrabble
noun an animal that walks with the entire sole of the foot touching the ground as e.g. bears and human beings
adjective (of mammals) walking on the whole sole of the foot (as rabbits, raccoons, bears, and humans do)
originFrom French plantigrade, from Latin planta (“sole of the foot”) (from Proto-Indo-European *pléh₂-n̥t-eh₂, from *pleh₂- (“flat”)) + -grade, from Latin gradus (“pace, step”).
Etymology from Wiktionary, CC BY-SA 3.0