Definitions for mainmastˈmeɪnˌmæst, -ˌmɑst; Naut. -məst
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Random House Webster's College Dictionary
main•mastˈmeɪnˌmæst, -ˌmɑst; Naut. -məst(n.)
the second mast from forward in any ship having two or more masts, except for a yawl or ketch.
Category: Nautical
Origin of mainmast:
1475–85
Princeton's WordNet
mainmast(noun)
the chief mast of a sailing vessel with two or more masts
Wiktionary
mainmast(Noun)
The chief, and tallest mast of a sailing ship that has more than one mast.
Webster Dictionary
Mainmast(noun)
the principal mast in a ship or other vessel
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