Alternative form of main sequence.

(astronomy) A major grouping of stars represented on a Hertzsprung-Russell diagram by a nearly uniform band of increasing luminosity with increasing surface temperature.

Alternative form of mainsheet

The conduit through which coal gas or natural gas is conveyed to users.

plural of gas main

plural of Maine Coon

A large, fluffy semi-longhair domestic cat of a breed that originated in Maine.

plural of main line

Alternative spelling of mainline

Used other than figuratively or idiomatically: see main, drag. / (informal) The main street of a town or suburb, or the principal highway passing through a rural area.