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gypsum a mineral, hydrated calcium sulfate, that resembles chalk and is used to make plaster of Paris, plaster and wallboard, and fertilizers.
Gypsy one of a nomadic people, originally from India, now found throughout the world. [3 definitions]
gypsy moth a moth having as its larva a hairy caterpillar that is extremely destructive to foliage.
gyrate to move or revolve on or around a fixed point or axis, or in a circle or spiral; rotate; spin.
gyration the act of gyrating; rotation.
gyre a ring, circle, or spiral. [2 definitions]
gyrfalcon any of several large falcons found in or near the arctic, having white, gray, and black plumage.
gyro1 a gyroscope. [2 definitions]
gyro2 a sandwich made of pita bread stuffed with meat roasted on a rotating spit or skewer and various vegetables and condiments.
gyro- spinning; spiral.
gyrocompass a navigational device with a gyroscope rotor that maintains a stable orientation toward true north.
gyroscope a device with a rotating wheel or disk, mounted on an axis that can turn freely in various or all directions, so that the wheel or disk can maintain a stable orientation in space despite any movement in its supports or surrounding parts.
gyrostabilizer a stabilizing device on planes and ships, consisting of a heavy, vertically mounted gyroscope whose spinning reduces the side-to-side motion of the craft.
gyrus a winding and twisted ridge, esp. on the surface of the brain.
H symbol of the chemical element hydrogen.
h the eighth letter of the English alphabet. [2 definitions]
Ha symbol of the chemical element hahnium.
ha used as an exclamation of triumph, surprise, discovery, perplexity, or annoyance.
Habakkuk a minor Hebrew prophet of the seventh century B.C. [2 definitions]
habeas corpus in law, a writ calling for a detained person to be brought before a court, designed to insure against unlawful detention or imprisonment.
haberdasher in the United States, a retailer of menswear.