\Let"tic\ (l[e^]t"t[i^]k), a.
(a) Of or pertaining to the Letts; Lettish.
(b) Of or pertaining to a branch of the Slavic family,
    subdivided into Lettish, Lithuanian, and Old Prussian. --
    n.
(a) The language of the Letts; Lettish.
(b) The language of the Lettic race, including Lettish,
    Lithuanian, and Old Prussian.