[1] : The Collaborative International Dictionary of English v.0.48

unio \u"nio\, n. nl., fr. l. unio unity, union, a single large
   pearl. see union. zool.
   any one of numerous species of fresh-water mussels belonging
   to unio and many allied genera.
   1913 webster
see also:
union unio 

[2] : WordNet (r) 2.0

unio
     n : type genus of the family unionidae syn: genus unio
see also:
genus unio 

Unio >> U Words
Unio, definition of term: Unio
unio_pag1.html

Industrial Unio >> I Words
Industrial Unio, definition of term: Industrial Unio
industrial+unio_pag1.html