(chemistry) In the periodic table of the elements, any of the eight groups (columns) of elements that contain the lightest (and most common) elements.

(computing) The primary volatile memory of a computer, not including memory cache, persistent disk storage, or external storage.

The main serving or dish of a meal, usually cooked.

The most important building of a group of buildings (e.g. in a school/university).

The generic street name (and often the official name) of the primary retail street of a village, town, or small city in the United States, Canada, Ireland, some parts of Scotland and also in some countries in central Europe.

(nautical) On a wooden mast, a circular disc (or sometimes a rectangle) of wood near or at the top of the mast, usually with holes or sheaves to reeve signal halyards; also a temporary or emergency place for a lookout.

plural of water main

The mainland coast of Spanish America.

(music) In musical notation, an instruction for the pianist to use the right hand.

(music) In musical notation, an instruction for the pianist to use the left hand. / (weaponry) A type of parrying dagger.