The Collaborative International Dictionary of English v.0.48:
Stonechat \Stone"chat`\, n. [Stone + chat.] [So called from the
similarity of its alarm note to the clicking together of two
(a) A small, active, and very common European singing bird
(Pratincola rubicola); -- called also chickstone,
stonechacker, stonechatter, stoneclink,
(b) The wheatear.
(c) The blue titmouse.
Note: The name is sometimes applied to various species of
Saxicola, Pratincola, and allied genera; as, the
pied stonechat of India (Saxicola picata).