Definition of Babinski reflex in US English:
 Babinski reflex
nounbəˈbinskē ˌrēfleksbəˈbinskē ˌrēfleks
A reflex action in which the big toe remains extended or extends itself when the sole of the foot is stimulated, abnormal except in young infants.
 Example sentencesExamples
-  He realized since 1896 that the Babinski reflex was part of the flexor reflex synergy.
 -  But the two are not entirely the same as the Babinski reflex evaluates the fanning of the large toe and animals do not have this.
 -  The deep reflexes were hyperactive; the Babinski reflexes were positive.
 -  The Babinski reflex is not, in and of itself, diagnostic for a particular condition.
 -  Because of the erroneous assumption that the change in the Babinski reflex was necessarily beyond an individual's volitional control, the experimenters had not employed a control group.
 
Origin
  
Named for Joseph François Felix Babinski (1857–1932), French neurologist.