1. a game in which a flat stone is bounced along the surface of calm water;
The Collaborative International Dictionary of English v.0.48:
Drakestone \Drake"stone\, n.
A flat stone so thrown along the surface of water as to skip
from point to point before it sinks; also, the sport of so
throwing stones; -- sometimes called ducks and drakes.
Internal earthquakes, that, not content with one throe,
run along spasmodically, like boys playing at what is
called drakestone. --De Quincey.
WordNet (r) 3.0 (2006):
ducks and drakes
n 1: a game in which a flat stone is bounced along the surface
of calm water