Twain :: Twain (a. & n.) Two; -- nearly obsolete in common discourse, but used in poetry and burlesque..
Twaite :: Twaite (n.) A European shad; -- called also twaite shad. See Shad.
Twaite :: Twaite (n.) A piece of cleared ground. See Thwaite.
Untwain :: Untwain (v. t.) To rend in twain; to tear in two.