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Webster 1913 Edition
Gable
Ga′ble
,Noun.
 A cable. 
[Archaic] 
Chapman.
 Ga′ble
,Noun.
 [OE. 
gable
, gabil
, F. gable
, fr. LL. gabalum 
front of a building, prob. of German or Scand. origin; cf. OHG. gibil
, G. giebel 
gable, Icel. gafl
, Goth. gibla 
pinnacle; perh. akin to Gr. [GREEK] head, and E. cephalic
, or to G. gabel 
fork, AS. geafl
, E. gaffle
, L. gabalus 
a kind of gallows.] (Arch.) 
(a) 
The vertical triangular portion of the end of a building, from the level of the cornice or eaves to the ridge of the roof. Also, a similar end when not triangular in shape, as of a gambrel roof and the like. 
Hence: (b) 
The end wall of a building, as distinguished from the front or rear side. 
(c) 
A decorative member having the shape of a triangular gable, such as that above a Gothic arch in a doorway. 
Webster 1828 Edition
Gable
GA'BLE
,Noun.