Foot Bone Roughly Shaped Like a Square Prism

This page is the CodyCross answer for the clue below from Campsite Adventures, Group 836, Puzzle 4 (Eating Utensils).

Question is: Foot Bone Roughly Shaped Like a Square Prism

and the answer is: CUBOID

Word Meaning:

CUBOID — Of the shape of a cube.

Definitions from Wiktionary.