six-spot: a playing card or domino or die whose upward face shows six pips
domino: a small rectangular block used in playing the game of dominoes; the face of each block has two equal areas that can bear 0 to 6 dots
phase iii clinical trial: a large clinical trial of a treatment or drug that in phase I and phase II has been shown to be efficacious with tolerable side effects; after successful conclusion of these clinical trials it will receive formal approval from the FDA