negatron negatron /ˈnɛgətrɑːn/

noun

1. An elementary particle with negative charge  ( negatron , electron )
   an elementary particle with negative charge
     The electron whizzed around the nucleus, a fundamental particle in the atom.
   The electron whizzed around the nucleus, a fundamental particle in the atom.
   
   

 hop-step-and-jump hop-step-and-jump /ˈhɒpstɛpəndˈdʒʌmp/

noun

1. An athletic contest in which a competitor must perform successively a hop and a step and a jump in continuous movement  ( hop-step-and-jump , triple jump )
   an athletic contest in which a competitor must perform successively a hop and a step and a jump in continuous movement
   
   

 serosa serosa /sɪˈroʊsə/

noun

1. A thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid  ( serosa , serous membrane )
   a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid
   
   

 checker checker /ˈtʃɛkɝ/

noun

1. (checkers) one of the flat round pieces used in playing the game of checkers  ( checker , chequer [Canadian, British] )
   (checkers) one of the flat round pieces used in playing the game of checkers
   
   
2. One who checks the correctness of something  ( checker )
   one who checks the correctness of something
   
3. [ N. American] An attendant who checks coats or baggage  ( checker [ N. American] )
   an attendant who checks coats or baggage
   

verb

1. [ N. American] Variegate with different colors, shades, or patterns  ( checker [ N. American] , chequer [Canadian, British] )
   variegate with different colors, shades, or patterns
   
2. [ N. American] Mark into squares or draw squares on; draw crossed lines on  ( check [ N. American] , checker [ N. American] , chequer [Canadian, British] )
   mark into squares or draw squares on; draw crossed lines on