Bone matrix not yet calcified.
                                                            
                                                     
                        
                                                
                        
                        
                            Immature bone that has not yet undergone calcification. [See: Fluoride & Osteoid | Fluoride & Osteomalacia
                                                            
                                                     
                        
                                                
                        
                        
                            Uncalcified bone matrix, the product of osteoblasts.
                                                            
                                                     
                        
                                                
                        
                        
                            Bone matrix which is unmineralized
                                                            
                                                     
                        
                                                
                        
                        
                            Osteoid is a protein mixture which is secreted by osteoblasts. When it mineralizes, it becomes bone. Osteoid is primarily composed of Type I collagen.