/on'euh mas"tik/ , adj.
1. of or pertaining to proper names.
2. of or pertaining to onomastics.
3. Law. (of a signature) written in the handwriting other than that of the document, instrument, etc., to which it is appended.
[ 1600-10; onomastikós, deriv. of onomázein to NAME; see -TIC ]