noun

• (linguistics) The descendant of an earlier language element, such as a word or phoneme, in a daughter language.
• (linguistics, rare) The ancestor word corresponding to a descendant.
  "The Middle Korean reflex for mey was mwoy 뫼"
• (chiefly photography) A reflection or an image produced by a reflection; the light reflected from an illuminated surface to one in shade.
  "A reflex camera uses a mirror to reflect the image onto a ground-glass viewfinder."

adj

• (geometry, of an angle) Having greater than 180 degrees but less than 360 degrees.
  "A polygon is said to be convex when no one of its angles is reflex."
• (painting) Illuminated by light reflected from another part of the same picture.

verb

• (transitive) To bend back or turn back over itself.
• (transitive, obsolete) To reflect (light, sight, etc.).
• (transitive, obsolete) To reflect or mirror (an object), to show the image of.
• (transitive, obsolete) To cast (beams of light) on something.
  "The ſpring is hindered by your ſmoothering hoſt, For neither rain can fall vpon the earth, Nor Sun reflexe his vertuous beames thereon. The ground is mantled with ſuch multitudes."