hypoplastic

/ˌhaɪpoʊˈplæstɪk/
adjective
  1. Describing a body part, organ, or tissue that is underdeveloped or smaller than normal.
    • Hypoplastic kidneys may not filter blood as effectively as normal kidneys.
    • The X-ray showed a hypoplastic thumb on the patient's right hand.
    • The dentist noticed hypoplastic enamel on the child's front teeth.
Antonyms
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