Babinski reflex
noun
Ba·bin·ski reflex
bə-ˈbin(t)-skē-
variants
or Babinski sign
or less commonly Babinski's reflex
or Babinski's sign
: a reflex movement in which when the sole is tickled the big toe turns upward instead of downward and which is normal in infancy but indicates damage to the central nervous system (as in the pyramidal tracts) later in life
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Merriam-Webster unabridged
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