Sŷn'ar-thrō'sis, n.

n. [Gr. συναρθρώσις, a being jointed together, from συναρθροῦν, to link or joint together, from σύν, with, and ἄρθρον, a joint; Fr. synarthrose.] (Anat.) Union of bones without motion; close union, as in sutures, symphysis, and the like. Coxe.