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From The Collaborative International Dictionary of English v.0.48:
Nanism \Na"nism\ (n[=a]"n[i^]z'm; n[a^]n"[i^]z'm), n. [Gr. na^nos + -ism: cf. F. nanisme.] The condition of being abnormally small in stature; dwarfism; dwarfishness; -- opposed to gigantism. [Webster 1913 Suppl.] Nanjing