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hustler (informal) an aggressively ambitious person.
hut a small dwelling or shelter, often made of grass, mud, logs, and the like. [2 definitions]
hutch a pen or shelter, esp. for a small animal such as a rabbit. [4 definitions]
huzoor a Hindu term of respect akin to "sir."
huzzah hurray! (formerly used to express approval, joy, appreciation, or encouragement).
hwy. abbreviation of "highway," a main road, esp. a major public road on which one can drive at high speeds, esp. between cities.
hyacinth any of various plants related to the lily that sprout from bulbs and bear spikes of fragrant, variously colored blossoms. [3 definitions]
Hyades a cluster of more than two hundred stars in the constellation Taurus. [2 definitions]
hyaena variant of hyena.
hyaline a transparent or hornlike substance sometimes found in cysts or in cartilage. [4 definitions]
hyalite a translucent, colorless opal.
hybrid the offspring of two plants or animals that differ genetically as to species, variety, breed, or the like. [5 definitions]
hybrid car a car with an engine that can run on two different fuels, usually gasoline and electricity, and can alternate between them.
hybridize to cause to produce hybrids; crossbreed. [3 definitions]
hydra (usu. cap.) in Greek mythology, the serpent with nine heads, of which one was immortal, slain by Hercules. [4 definitions]
hydrangea any of various shrubby plants that are grown for their large round or flat clusters of blue, pink, or white blossoms. [2 definitions]
hydrant an upright pipe with a valve from which water can be drawn from a water main.
hydrate a compound that contains water in chemical combination. [2 definitions]
hydraulic of, concerning, operated by, or moved by water or another liquid under pressure. [3 definitions]
hydraulic ram a water pump or device using the energy of downward flowing water to lift a part of the water for some other use.
hydraulics (used with a sing. verb) the science or technology concerned with the mechanical uses of fluids, esp. water, in motion.