1) Synosteosis 
Synostosis means fusion of two bones, it can be normal in puberty, fusion of the epiphysis, or abnormal. When synostosis is abnormal it is a type of dysostosis. Examples of synostoses include: craniosynostosis- being an abnormal fusion of two or more cranial bones; radioulnar synostosis- being the abnormal fusion of the radius and ulna bones of th...
• (n.) Same as Synosteosis.
(sin″os-to´sis) normal or abnormal union of two bones by osseous material. adj., synostot´ic., adj.
The fusion of adjacent bones due to disease
Syn`os·to'sis noun [ New Latin ] Same as Synosteosis . 
The joining of bones by the ossification of the connecting tissues.
Type: Term Pronunciation: sin′os-tō′sis Definitions: 1. Osseous union between two bones that are not supposed to be united; commonly refers to formation of a bony bundle between the radius and ulna following fracture of these two bones. Synonyms: bony ankylosis, synosteosis, true ankylosis
The union of adjacent bones by means of osseous union of bones that are normally separate
union of separate bones into a single bone.