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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.
IA an abbreviation for Iowa.
-ic a suffix that means "like" or "having to do with." [3 definitions]
-ical a suffix that means "related to" or "like." [2 definitions]
ice water in a frozen, solid state. [6 definitions]
ice age a long period of time when glaciers covered large parts of the earth.
iceberg a large floating mass of ice that has broken from a glacier.
icebox a refrigerator. [2 definitions]
icebreaker a ship that can break a passage through thick ice. [2 definitions]
ice cap a large, thick sheet of ice that spreads out over the land in all directions from the center.