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hydrogen bomb	a very powerful type of bomb. When its hydrogen atoms are forced together under great heat and pressure, they release energy in a huge explosion.
hyena	a mammal with very long front legs and shorter back legs. Hyenas look something like dogs, but are more closely related to cats. They have a cry that sounds like strange human laughter. Most kinds of hyena are nocturnal. They hunt for food and also eat the remains of dead animals. Hyenas are found in Africa and Asia.
hygiene	the practice of keeping clean to stay healthy and prevent disease.
hygienist	a person skilled in the areas of hygiene, such as a dentist's assistant.
hymn	a song or poem written in praise of God or a country.
hymnal	a book of church hymns.
hype	to create interest in by making exaggerated claims. [2 definitions]
hyperactive	very active or stimulated beyond what is normal.
hypertext markup language	a computer language used to create documents on the World Wide Web; html.
hyphen	a punctuation mark (-). It is used to join the parts of a compound word. It is also used at the end of a line to divide a word between syllables.
hyphenate	to write, join, or divide with a hyphen.
hypnosis	a condition like sleep that is caused by the direction of another person. People under hypnosis may do or say things as directed or suggested by the person who has put them in this condition.
hypnotize	to put into a state of hypnosis.
hypocrite	a person who pretends to be different or better than he or she really is. Someone who does not act according to his or her stated beliefs is a hypocrite.
hypotenuse	the side opposite the right angle in a right triangle; the longest side of a right triangle.
hypothermia	a condition of very low body temperature.
hypothesis	a prediction or educated guess that can be tested and can be used to guide further study.
hysterical	having or likely to have fits of wild behavior such as laughing or crying. [2 definitions]
I¹	the one who is speaking or writing.
I²	symbol of the chemical element iodine.
i	the ninth letter of the English alphabet.

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