The Collaborative International Dictionary of English v.0.48:

Remonstrant \Re*mon"strant\ (-strant), a. [LL. remonstranc,
   -antis, p. pr. of remonstrare: cf. OF. remonstrant, F.
   remontrant.]
   Inclined or tending to remonstrate; expostulatory; urging
   reasons in opposition to something.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Remonstrant \Re*mon"strant\, n.
   One who remonstrates; specifically (Eccl. Hist.), one of the
   Arminians who remonstrated against the attacks of the
   Calvinists in 1610, but were subsequently condemned by the
   decisions of the Synod of Dort in 1618. See Arminian.
   [1913 Webster]