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quassia a scarlet-flowered tropical American tree, the wood of which is used in making furniture. [2 definitions]
quaternary consisting of four, or grouped in fours. [4 definitions]
quatrain a group of four lines of verse, esp. one in which every other line rhymes.
quatrefoil a four-lobed leaf or flower, esp. in art. [2 definitions]
quattrocento the fifteenth century in Italian art and literature.
quaver to tremble or shake, as from exhaustion or illness. [6 definitions]
quay a pier, wharf, or other structure built along a shore for landing, loading, and unloading boats or ships.
qubit a fundamental unit of information in quantum computing that is equivalent to the binary bit used in traditional computing; quantum bit. Whereas the binary bit can only exist in two states (0 or 1), the qubit can exist in three states (0, 1, or 0 and 1 simultaneously).
queasy feeling nausea. [3 definitions]
Quebec an eastern Canadian province on the U.S. border between New Brunswick and Ontario.
Quebecois a French-speaking native of Quebec, or a descendant thereof.
Quechua a member of a South American Indian people once dominant in the former Inca empire. [2 definitions]
queen a female ruler or monarch. [5 definitions]
Queen Anne's lace a common weed related to the carrot that bears large, lacy umbels of tiny white flowers.
queen consort a reigning king's wife.
queen dowager a king's widow.
queenly befitting or like a queen. [2 definitions]
queen mother a queen dowager who is the mother of a reigning king or queen.
queen post one of two upright posts that are set between the tie beam and rafters of a roof truss, one on either side of center.
Queens a borough of New York City, on western Long Island.
Queen's Birthday in the UK and much of the Commonwealth, a public holiday on the second Saturday in June to officially celebrate the monarch's birthday, when the monarch is a woman.