D defs.my
Entry 1 sense Webster, 1913

Poser

/pōz'-ẽr/ · Pos·er · IPA /ˈpoʊzɚ/
01 n. One who, or that which, puzzles; a difficult or inexplicable question or fact.
  1. 1.
    One who, or that which, puzzles; a difficult or inexplicable question or fact.