From dispread +‎ -er.

dispreader (plural dispreaders)

1. (archaic, rare) Someone who spreads or propagates.
   • 1618 December 15 (Gregorian calendar), Daniel Featley, “The Smoaking Flaxe. A Sermon Preached at Lambeth before His Grace, the Lord Bishop of London, ”, in Clavis Mystica: A Key Opening Divers Difficult and Mysterious Texts of Holy Scripture; , London: R Y for Nicolas Bourne, , published 1636, →OCLC, page 15:

     Joſeph of Arimathea, richer in grace than wealth, and a great diſpreader of the Goſpel, and (as many ancient Writers report) the firſt planter of Chriſtian Rehbgion in this Iſland, yet till Chriſts death had ſmall courage to profeſſe him;

   • 1644, John Milton, Areopagitica; a Speech of Mr. John Milton for the Liberty of Unlicenc’d Printing, to the Parlament of England, London: , →OCLC, page 14:

     Beſides another inconvenience, if learned men be the firſt receivers out of books, & diſpredders both of vice and error, how ſhall the licencers themſelves be confided in, unleſſe we can conferr upon them, or they aſſume to themſelves above all others in the Land, the grace of infallibility, and uncorruptedneſſe?

     • 1738, “Areopagitica: A Speech for the Liberty of Unlicens’d Printing, to the Parlament of England”, in A Complete Collection of the Historical, Political, and Miscellaneous Works of John Milton: , volume I, London: A Millar, , →OCLC, page 148:

       Beſides another inconvenience, if learned Men be the firſt receivers out of Books, and diſpreaders both of vice and error, how ſhall the Licenſers themſelves be confided in, unleſs we can confer upon them, or they aſſume to themſelves above all others in the Land, the grace of infallibility, and uncorruptedneſs?

   • 1885, Richard F Burton, transl. and editor, “The Hermits. ”, in A Plain and Literal Translation of the Arabian Nights’ Entertainments, now Entituled The Book of the Thousand Nights and a Night , Shammar edition, volume III, : Burton Club , →OCLC, page 126 of 125–126:

     Now they resorted only to that mountain where the hermit was, and the reason of their foregathering with the holy man was their assiduity in repeating “Praised be Allah!” for it is recounted that the pigeon sayeth in praise, “Praised be the Creator of all Creatures, the Distributor of daily bread, the Builder of the heavens and Dispreader of the earths!”

• “dispreader”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.