Anatomy
thumb
thumb struc·ture
Subclass of:
Fingers
Definitions related to thumb:
  • The first digit on the radial side of the hand which in humans lies opposite the other four.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • (hand digit 1) The thick and short hand digit which is next to the index finger in humans.
    NCI
    U.S. National Cancer Institute, 2021
  • Thumb, short, thick first digit of the human hand and of the lower-primate hand and foot. It differs from other digits in having only two phalanges (tubular bones of the fingers and toes). The thumb also differs in having much freedom of movement and being opposable to tips of other digits. The...
    Encyclopedia Britannica
    Encyclopedia Britannica, Inc., 2025
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