We found one dictionary that defines the word windward sides:

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1. windward sides: Vocabulary.com

(Note: See windward_side as well.)

Definitions from WordNet (windward side) ▸ noun:  the side toward the wind ▸ Also see windward_side ▸ Words similar to windward sides ▸ Usage examples for windward sides ▸ Idioms related to windward sides ▸ Wikipedia articles (New!) ▸ Words that often appear near windward sides ▸ Rhymes of windward sides ▸ Invented words related to windward sides