Webster's English Dictionary

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obelisk

ob.e.lisk \'a:b-*-.lisk, -l*sk\ n [MF obelisque, fr. L obeliscus, fr. Gk 
   obeliskos, fr. dim. of] obelos 1: an upright 4-sided usu. monolithic pillar 
   that gradually tapers as it ri ses and terminates in a pyramid 2a: OBELUS  
   2b: DAGGER