reflex

/R IY1 F L EH0 K S/
noun
  1. 1

    An automatic response to a simple stimulus which does not require mental processing.

  2. 2

    The descendant of an earlier language element, such as a word or phoneme, in a daughter language.

  3. 3

    The descendant of anything from an earlier time, such as a cultural myth.

  4. 4

    Reflection or an image produced by reflection. The light reflected from an illuminated surface to one in shade.

verb
  1. 1

    To bend, turn back or reflect.

  2. 2

    To respond to a stimulus.

adjective
  1. 1

    Bent, turned back or reflected.

  2. 2

    Produced automatically by a stimulus.

  3. 3

    (of an angle) Having greater than 180 degrees but less than 360 degrees.

  4. 4

    Illuminated by light reflected from another part of the same picture.

Synonyms

Source: https://en.wiktionary.org/wiki/reflex