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nounimperfect development; nondevelopment of a part
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Words sounding like good agenesis
genesis spermatogenesis parthenogenesis xenogenesis autogenesis morphogenesis teratogenesis psychogenesis pathogenesis palingenesis oogenesis ontogenesis neurogenesis monogenesis metagenesis kenogenesis hypnogenesis heterogenesis hematogenesis haematogenesis glycogenesis gametogenesis epigenesis digenesis cytogenesis cenogenesis caenogenesis blastogenesis biogenesis agenesis