Webster's English Dictionary

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haploid

hap.loid \'hap-.lo.id\ \-.lo.id-e-\ aj [ISV, fr. Gk haploeide-s single, fr. 
   haploos] 1: having the gametic number of chromosomes or half the number 
   characteris tic of somatic cells 2: MONOPLOID  - haploid n