Find the word definition

The Collaborative International Dictionary
Synarthroses

Synarthrosis \Syn`ar*thro"sis\, n.; pl. Synarthroses. [NL., fr. Gr. ? a being jointed together, fr. ? to link or joint together; sy`n with + ? a joint.] (Anat.) Immovable articulation by close union, as in sutures. It sometimes includes symphysial articulations also. See the Note under Articulation, n., 1.

Wiktionary
synarthroses

n. (plural of synarthrosis English)

WordNet
synarthroses