We found 3 dictionaries that define the word extension ladders:

General (3 matching dictionaries)

1. extension ladders: Merriam-Webster
2. extension ladders: Collins English Dictionary
3. extension ladders: Vocabulary.com

(Note: See extension_ladder as well.)

Definitions from WordNet (extension ladder) ▸ noun:  a ladder whose length can be extended ▸ Also see extension_ladder ▸ Words similar to extension ladders ▸ Usage examples for extension ladders ▸ Idioms related to extension ladders ▸ Wikipedia articles (New!) ▸ Words that often appear near extension ladders ▸ Rhymes of extension ladders ▸ Invented words related to extension ladders