The Collaborative International Dictionary
Crowstone
Crowstone \Crow"stone`\ (kr?"st?n`), n. (Arch.)
The top stone of the gable end of a house.
--Halliwell.
Wiktionary
crowstone
n. 1 (context architecture English) The top stone of the gable end of a house. 2 (context UK dialect English) ganister, a kind of sandstone