triose: any monosaccharide sugar containing three atoms of carbon per molecule
monosaccharide: a sugar (like sucrose or fructose) that does not hydrolyse to give other sugars; the simplest group of carbohydrates
powder photography: a process for identifying minerals or crystals; a small rod is coated with a powdered form of the substance and subjected to suitably modified X-rays; the pattern of diffracted rings is used for identification