From WordNet (r) 3.0 (2006) [wn]:
kayak
n 1: a small canoe consisting of a light frame made watertight
with animal skins; used by Eskimos
v 1: travel in a small canoe; "we kayaked down the river"
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Kayak \Kay"ak\, n. (Naut.)
A light canoe, made of skins stretched over a frame, and
usually capable of carrying but one person, who sits
amidships and uses a double-bladed paddle. It is peculiar to
the Eskimos and other Arctic tribes.
[1913 Webster]