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quartz crystal
quartz glass
quartz heater
quartz-iodine lamp
quartz lamp
quartz watch
quartziferous
quartzite
quasar
quash (1)
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quaternion

qua·ter·ni·on [ kwə túrnee ən ] (plural qua·ter·ni·ons)


noun 
Definition:
 
generalized complex number: a generalized complex number that contains four terms, one real and three imaginary, and is the sum of a real number and a vector

[14th century. < late Latin quaternion-< Latin quaterni (see quaternary)]
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