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Mainsail

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• Main-sail

  [meyn-seyl; Nautical meyn-suh l] /ˈmeɪnˌseɪl; Nautical ˈmeɪn səl/ noun, Nautical. 1. the lowermost on a mainmast. /ˈmeɪnˌseɪl; nautical ˈmeɪnsəl/ noun 1. (nautical) the largest and lowermost sail on the mainmast (Gr. artemon), answering to the modern “mizzen-sail,” as some suppose. Others understand the “jib,” near the prow, or the “fore-sail,” as likely to be most […]

• Main-sequence

  noun, Astronomy. 1. a narrow band in the Hertzsprung-Russell diagram in which 90 percent of all observed stars are plotted. noun 1. (astronomy) main sequence (mān) The continuous, generally diagonal line or band in the Hertzsprung-Russell diagram ranging from the upper left to the lower right and representing stars of average size whose luminosities correspond […]

• Main-sequence star

  noun any star lying on a diagonal band that extends from hot stars of high luminosity to cool stars of low luminosity; any stars in the Hertzsprung-Russell diagram from the upper left to the lower right of the diagram; also written main sequence star Examples Most stars in the Sun’s neighborhood are main sequence stars.

• Main-shaft

  noun, Machinery. 1. the principal shaft of a motor, transmission, etc. (distinguished from ).

• Mainsheet

  [meyn-sheet] /ˈmeɪnˌʃit/ noun, Nautical. 1. a of a mainsail. /ˈmeɪnˌʃiːt/ noun 1. (nautical) the line used to control the angle of the mainsail to the wind

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