nanism
nounAberration from normal form by decrease in size; the character or quality of being dwarfed or pygmy; dwarfishness: opposed to gigantism.
nounThe condition of being abnormally small in stature; dwarfism; dwarfishness; — opposed to
Unusually small size, as a result of a developmental abnormality
nouna genetic abnormality resulting in short stature