Source : Webster's Revised Unabridged Dictionary (1913)

Italicize \I*tal"i*cize\, v. t. & i. [imp. & p. p. {Italicized};
   p. pr. & vb. n. {Italicizing}.]
   To print in Italic characters; to underline written letters
   or words with a single line; as, to Italicize a word;
   Italicizes too much.

Source : WordNet®

italicize
     v : print in italics [syn: {italicise}]