D defs.my
Entry 2 senses Webster, 1913

Protean

/prō'ti-ən/ · Pro·te·an · IPA /ˈpɹoʊ.tɪ.ən/
01 a. Of or pertaining to Proteus; characteristic of Proteus.
  1. 1.
    Of or pertaining to Proteus; characteristic of Proteus.
  2. 2.
    Exceedingly variable; readily assuming different shapes or forms; as, an amœba is a protean animalcule.