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

Pronunciation:
bah-BIN-skee REE-flecks

In a sentence:
While discussing the Babinski reflex in class, Professor Richards began to ask for female volunteers with “nice, big, ticklish…toes…”

In a different sentence:
Dr. Patel noted a severe case of Babinski reflex in his patient, but decided not to say anything because he was sick and tired of treating foot disorders.