We found one dictionary that defines the word windowsole:

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1. windowsole: Wiktionary

Definitions from Wiktionary (windowsole) ▸ noun:  (dialectal) windowsill ▸ Words similar to windowsole ▸ Usage examples for windowsole ▸ Idioms related to windowsole ▸ Wikipedia articles (New!) ▸ Popular adjectives describing windowsole ▸ Words that often appear near windowsole ▸ Rhymes of windowsole ▸ Invented words related to windowsole