Source : Webster's Revised Unabridged Dictionary (1913)

Osteoblast \Os"te*o*blast\, n. [Osteo- + -blast.] (Anat.)
   One of the protoplasmic cells which occur in the osteogenetic
   layer of the periosteum, and from or around which the matrix
   of the bone is developed; an osteoplast.

Source : WordNet®

osteoblast
     n : a cell from which bone develops [syn: {bone-forming cell}]