The Collaborative International Dictionary of English v.0.48:

Latria \La*tri"a\ (l[.a]*tr[imac]"[.a]; 277), n. [L., fr. Gr.
   latrei`a, fr. latrey`ein to serve, fr. la`tris servant.]
   The highest kind of worship, or that paid to God; --
   distinguished by the Roman Catholics from dulia, or the
   inferior worship paid to saints.
   [1913 Webster]