A general contractor.

(US, slang) The primary woman that a man is romantically involved with / (by extension) Something or someone of great importance.

plural of main memory

(medicine, colloquial) Short for left main coronary artery.

The most important factor; the principle consideration.

Alternative form of maindeck

plural of main-deck

The American lobster, Homarus americanus.

plural of Maine lobster

(nautical) The deck below the spar deck.