The Collaborative International Dictionary of English v.0.48:

Latinism \Lat"in*ism\, n. [Cf. F. latinisme.]
   A Latin idiom; a mode of speech peculiar to Latin; also, a
   mode of speech in another language, as English, formed on a
   Latin model.
   [1913 Webster]

   Note: The term is also sometimes used by Biblical scholars to
         designate a Latin word in Greek letters, or the Latin
         sense of a Greek word in the Greek Testament.
         [1913 Webster]

WordNet (r) 3.0 (2006):

Latinism
    n 1: a word or phrase borrowed from Latin