Definitions:

1. A wall that has a triangular section at the end. NOUN
   • They painted the gable wall a striking blue to contrast with the white trim of the house.
2. The vertical triangular wall between the sloping ends of a gable roof. NOUN
   • The gable wall was reinforced to support the weight of the new roof structure.

Synonyms:

• apex wall
• end wall
• gable
• gable end
• roof end wall