Synovia

from 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}]

from 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]