doublet

noun

• A pair of two similar or equal things; couple.
• One of two or more different words in a language derived from the same etymological root but having different phonological forms (e.g., toucher and toquer in French or shade and shadow in English).
• In textual criticism, two different narrative accounts of the same actual event.
• (lapidary) An imitation gem made of two pieces of glass or crystal with a layer of color between them.
• A word or phrase set a second time by mistake.
• A quantum state of a system with a spin of ½, such that there are two allowed values of the spin component, −½ and +½.
• A word (or rather, a halfword) consisting of two bytes.
• A very small flowering plant, Dimeresia howellii.
• A word ladder puzzle.
• An arrangement of two lenses for a microscope, designed to correct spherical aberration and chromatic dispersion, thus rendering the image of an object more clear and distinct.
• Either of two dice, each of which, when thrown, has the same number of spots on the face lying uppermost.

  "to throw doublets"

• A game somewhat like backgammon.
• Dipole antenna.