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theory a reasonable, widely accepted explanation for why something happens. [3 definitions]
therapist one who specializes in treating people with psychological, emotional, or social problems.
therapy treatment meant to cure a disease or heal an injury.
there in, at, or to that place. [7 definitions]
thereafter following that; from then on.
thereby as a result of that; by that means. [2 definitions]
therefore for that reason; as a result.
there's shortened form of "there is" or "there has."
thermal using, resulting from, or producing heat. [2 definitions]
thermometer an instrument for measuring temperature. Some thermometers are made of a closed glass tube containing mercury or alcohol that rises or falls as the temperature rises or falls.
Thermos (Trademark) A Thermos is a container that is used to keep food or drink at its original temperature. [2 definitions]
thermostat a device that automatically controls the temperature within a particular space after a person sets it for the temperature they want. Thermostats may be found in places like houses, apartments, office buildings, cars, and refrigerators.
thesaurus a book that lists words with their synonyms or antonyms.
these plural of "this."
they those people, animals, or things being pointed to. [4 definitions]
they'd shortened form of "they had" or "they would."
they'll shortened form of "they will."
they're shortened form of "they are."
they've shortened form of "they have."
thick large in measurement from one side of a surface to the opposite side; not thin in the smallest dimension of something. [6 definitions]
thicken to make or become thick or thicker.