noun

• (uncountable) Cereal plants, Oryza sativa of the grass family whose seeds are used as food.
  "Rice is a tropical plant; yet Carolina and Georgia grow the finest in the world; heavier grained, better filled, and more merchantable, than any imported into Europe from the Indies."
• (countable) A specific variety of this plant.
  "The rices of Kashmír are infinite in variety. In one tahsíl I have found fifty-three varieties."
• (uncountable) The seeds of this plant used as food.
  "Mold boiled rice, when hot, in cups which have been previously dipped in cold water; when cold, turn them out on a flat dish, arranging them uniformly; then with a tea-spoon scoop out a little of the rice from the top of each cone, and put in its place any kind of jelly."
• (uncountable, slang, ethnic slur, humorous) The types of automobile modifications characteristic of a rice burner.

verb

• (transitive) To squeeze through a ricer; to mash or make into rice-sized pieces (especially potatoes).
  "Riced Potato. Have a flat dish and the colander hot. With a spoon, rub mashed potato through the colander on to the hot dish."
• (intransitive) To harvest wild rice (Zizania spp.)
  "In northern Minnesota the whites have invented the verb "to rice," and speak of "ricing," i. e., harvesting the crop of wild rice."
• (rare) To throw rice at a person (usually at a wedding).
  "So far as I can make out, the idiotic function of “ricing” English brides and bridegrooms is not twenty years old."
• (computing, transitive) To customize the user interface of a computer system, e.g. a desktop environment. (derived from rice out)

noun

• (now chiefly, dialectal, Scotland, Ireland) A twig or stick.
  "To guard the bank from the impression of the water, a fence, OF STAKE AND RICE, may be made along the bottom of it next the sea, which will last till the surface on that side is sufficiently swarded, and the mound properly consolidated."
• (weaving, obsolete) A bobbin or spool.
  "[…] taken unlawfully from the same house five "machines called 'Engine-Weaving Loomes' worth thirty pounds, and two ounces of silke worth five shillings, and two joynt-stooles worth three shillings, and a pair of 'Rices to wind silke on' worth four shillings […]"

noun

• (medicine) Acronym of rest, ice, compression, elevation (“a treatment method for soft-tissue injuries”).
  "The care manager greeted Beth and Jim as they prepared to leave, […] and offered to give them brochures about RICE and physical therapy […] After the RICE therapy, Dr. Meredith recommended rehab for strengthening the ankle so that Beth could return to her physical fitness […]"
• (medicine) Acronym of rest, immobilization, cold, elevation (“a treatment method for soft-tissue injuries”).
• (chemistry) Acronym of reaction, initial, change, equilibrium (“a tabular system for keeping track of changing concentrations in an equilibrium reaction”).