Definitions for "Babinski sign"
An abnormal (dorsiflexor) plantar reflex.
extension of the great toe, with or without fanning of the other toes, in response to stimulation of the outer margin of the sole of the foot; normal up to 1 1/2 years of age
The reflexive extension and abduction of the toes after the medial, plantar surface of the foot is stroked; positive reflex (Babinski sign) is normal up to age 1.5 years; thereafter, a positive reflex indicates damage to descending tracts.