(automotive) a six-wheeled vehicle with six-wheel drive (each wheel has powered drive)

(nautical) A muzzleloading gun capable of firing shells weighing sixty-four pounds

(Internet slang, fandom slang, informal) The proposition that it is possible to find genderswapped versions of every fictional character, especially as fan art on the internet.

plural of 64th note

Arsphenamine.

(paper, printing) A size of paper or book: 1.87"-2.5" x 2.5"-3.125".

(paper, printing) Sexto, sixmo.

(paper, printing) Sixmo, sexto.

plural of A-6

(medicine) A protein from patients with Alzheimer's