This document provides directions to define 23 vocabulary terms related to bones and bone growth, including appositional growth, calcitonin, calcitriol, canaliculi, cartilage, diaphysis, endosteum, epiphyseal plate, epiphysis, Haversian canals, interstitial growth, lacunae, lamellae, marrow, metaphysis, osteoblasts, osteoclasts, osteocytes, osteogenic cells, osteon, periosteum, trabeculae, and Volkmann's canals. Definitions should be submitted in an initial post with proper APA referencing for any sources used.