Source : Webster's Revised Unabridged Dictionary (1913)

Kythe \Kythe\, Kithe \Kithe\ (k[imac][th]), v. t. [imp. {Kydde},
   {Kidde} (k[i^]d"de); p. p. {Kythed}, Kid; p. pr. & vb. n.
   {Kything}.] [OE. kythen, kithen, cu[eth]en, to make known,
   AS. c[=y][eth]an, fr. c[=u][eth] known. [root]45. See
   {Uncouth}, {Can} to be able, and cf. {Kith}.]
   To make known; to manifest; to show; to declare. [Obs: or
   Scot.]

         For gentle hearte kytheth gentilesse.    --Chaucer.