The Collaborative International Dictionary of English v.0.48:
Scotch \Scotch\, a. [Cf. Scottish.]
Of or pertaining to Scotland, its language, or its
Scotch broom (Bot.), the Cytisus scoparius. See Broom.
Scotch dipper, or Scotch duck (Zool.), the bufflehead; --
called also Scotch teal, and Scotchman.
Scotch fiddle, the itch. [Low] --Sir W. Scott.
Scotch mist, a coarse, dense mist, like fine rain.
Scotch nightingale (Zool.), the sedge warbler. [Prov. Eng.]
Scotch pebble. See under pebble.
Scotch pine (Bot.) See Riga fir.
Scotch thistle (Bot.), a species of thistle (Onopordon
acanthium); -- so called from its being the national
emblem of the Scotch.