| hap | (noun) an accidental happening | - |
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| haphazardness | (noun) the quality of lacking any predictable order or plan | Synonyms: noise, randomness, stochasticity |
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| haploid | (noun) (genetics) an organism or cell having only one complete set of chromosomes | - |
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| haploidy | (noun) the condition of being haploid | - |
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| haplosporidian | (noun) parasite in invertebrates and lower vertebrates of no known economic importance | - |
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| haplotype | (noun) (genetics) a combination of alleles (for different genes) that are located closely together on the same chromosome and that tend to be inherited together | - |
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| happening | (noun) an event that happens | Synonyms: natural event, occurrence, occurrent |
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| happenstance | (noun) an event that might have been arranged although it was really accidental | Synonyms: coincidence |
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| happiness | (noun) emotions experienced when in a state of well-being | - |
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| (noun) state of well-being characterized by emotions ranging from contentment to intense joy | Synonyms: felicity |
| haptoglobin | (noun) a protein in plasma that binds free hemoglobin and removes it (as from wounds) | - |
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