We found 8 dictionaries that define the word mainsails:

General (7 matching dictionaries)

1. mainsails: Merriam-Webster
2. mainsails: Collins English Dictionary
3. mainsails: Vocabulary.com
4. mainsails: Wordnik
5. mainsails: Wiktionary
6. mainsails: Dictionary.com
7. mainsails: TheFreeDictionary.com

Computing (1 matching dictionary)

8. mainsails: Encyclopedia

(Note: See mainsail as well.)

Definitions from Wiktionary (mainsail) ▸ noun:  (nautical) The largest (or only) sail on a sailing vessel. ▸ Also see mainsail Opposite: jibs, foresails, headsails ▸ Words similar to mainsails ▸ Usage examples for mainsails ▸ Idioms related to mainsails ▸ Wikipedia articles (New!) ▸ Popular adjectives describing mainsails ▸ Words that often appear near mainsails ▸ Rhymes of mainsails ▸ Invented words related to mainsails