For the noun: nemesis
Plural form: nemeses

WordReference Random House Learner's Dictionary of American English © 2017
nem•e•sis /ˈnɛməsɪs/USA pronunciation   n.[countable]pl.  -ses 
    /-ˌsiz/.USA pronunciation  
  1. a source or cause of harm or failure:The driving test was her nemesis; she failed it repeatedly.
  2. an opponent or rival that cannot be overcome:That pitcher was our team's nemesis; every time he faced us we lost.
  3. an agent of punishment for wrongdoing.

WordReference Random House Unabridged Dictionary of American English © 2017
nem•e•sis  (nemə sis),USA pronunciation n., pl.  -ses 
    (-sēz′).USA pronunciation 
  1. something that a person cannot conquer, achieve, etc.:The performance test proved to be my nemesis.
  2. an opponent or rival whom a person cannot best or overcome.
  3. Mythology(cap.) [Class. Myth.]the goddess of divine retribution.
  4. an agent or act of retribution or punishment.
  • Greek némesis literally, a dealing out, verbid of némein to dispense (justice); see -sis
  • Latin
    • 1.See corresponding entry in Unabridged Waterloo.
    • 4.See corresponding entry in Unabridged downfall, undoing, ruin, Waterloo.

Collins Concise English Dictionary © HarperCollins Publishers::

Nemesis /ˈnɛmɪsɪs/ n ( pl -ses / -ˌsiːz/)
  1. the goddess of retribution and vengeance
  2. (sometimes not capital) any agency of retribution and vengeance
Etymology: 16th Century: via Latin from Greek: righteous wrath, from némein to distribute what is due

'nemesis' also found in these entries:

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