D defs.my
Entry 2 senses Webster, 1913

Demonstrable

/dĕm'-ən-strəb-əl/ · De·mon·stra·ble · IPA /dɪˈmɑnstɹəbl̩/
01 a. Capable of being demonstrated; that can be proved beyond doubt or question.
  1. 1.
    Capable of being demonstrated; that can be proved beyond doubt or question.
    “The grand articles of our belief are as demonstrable as geometry.” Glanvill.
  2. 2.
    Proved; apparent.[Obs.]