From WordNet (r) 2.0 (August 2003) [wn]:
cliff
n : a steep high face of rock; "he stood on a high cliff
overlooking the town"; "a steep drop" [syn: drop,
drop-off]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Cliff \Cliff\ (kl[i^]f), n. [AS. clif, cloef; akin to OS. klif,
D. klif, klip, Icel. klif, Dan. & G. klippe, Sw. klippa;
perh. orig. a climbing place. See Climb.]
A high, steep rock; a precipice.
[1913 Webster]
Cliff swallow (Zool.), a North American swallow
(Petrochelidon lunifrons), which builds its nest against
cliffs; the eaves swallow.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Cliff \Cliff\, n. (Mus.)
See Clef. [Obs.]
[1913 Webster]