We found 3 dictionaries that define the word visible horizons:

General (3 matching dictionaries)

1. visible horizons: Merriam-Webster
2. visible horizons: Collins English Dictionary
3. visible horizons: Vocabulary.com

(Note: See visible_horizon as well.)

Definitions from WordNet (visible horizon) ▸ noun:  the line at which the sky and Earth appear to meet ▸ Also see visible_horizon ▸ Words similar to visible horizons ▸ Usage examples for visible horizons ▸ Idioms related to visible horizons ▸ Wikipedia articles (New!) ▸ Words that often appear near visible horizons ▸ Rhymes of visible horizons ▸ Invented words related to visible horizons