Webster's English Dictionary

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gnomon

gno.mon \'no--.ma:n, -m*n\ n [L, fr. Gk gno-mo-n interpreter, pointer on a 
   sundial, fr. gigno]-skein 1: an object that by the position or length of 
   its shadow serves as an indi cator esp. of the hour of the day : as 1a: the 
   style of an ordinary sundial  1b: a column or shaft erected perpendicular 
   to the horizon  2: the remainder of a parallelogram after the removal of a 
   similar parallel ogram containing one of its corners