Thu"ya (?), n. (Bot.) Same as Thuja.
Thu"yin (?), n. (Chem.) A substance extracted from trees of the genus
Thuja, or Thuya, and probably identical with quercitrin. [Written also
thujin.]
Thwack (thwk), v. t. [imp. & p. p. Thwacked (?); p. pr. & vb. n.
Thwacking.] [Cf. OE. thakken to stroke, AS. þaccian, E. whack.] 1. To
strike with something flat or heavy; to bang, or thrash: to thump. "A
distant thwacking sound." W. Irving.