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Four-H club an organization in the U.S. that teaches young people about farming and how to take care of a home. Four-H clubs are so named because they are meant to improve the heads, hearts, hands, and health of their members.
H-bomb a very powerful bomb that releases energy by nuclear fusion. "H-bomb" is short for hydrogen bomb.
hydrogen a very light gas that burns easily and is one of the chemical elements. Hydrogen is the most abundant element in the universe. It combines with oxygen to make water, and it is found in all living things. Hydrogen combines with many substances and has many uses. (symbol: H)