The Collaborative International Dictionary of English v.0.48:
Synovia \Syn*o"vi*a\, n. [NL., perhaps fr. Gr. sy`n with + L. ovum egg: cf. F. synovie.] (Anat.) A transparent, viscid, lubricating fluid which contains mucin and secreted by synovial membranes; synovial fluid. [1913 Webster]WordNet (r) 3.0 (2006):
synovia n 1: viscid lubricating fluid secreted by the membrane lining joints and tendon sheaths etc. [syn: synovia, synovial fluid]