MAINMAST
Meaning of MAINMAST in English
main ‧ mast /ˈmeɪnmɑːst, -məst $ -mæst, -məst/ BrE AmE noun [countable]
the largest or most important of the ↑ mast s on a ship
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012