Webster's English Dictionary

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extremity

ex.trem.i.ty \ik-'strem-*t-e-\ n 1a: the farthest or most remote part, 
   section, or point  1b: a limb of the body; esp : a human hand or foot  2a: 
   extreme danger or critical need  2b: a moment marked by imminent 
   destruction or death  3: the utmost degree (as of emotion or pain)  4: a 
   drastic or desperate act or measure