Definition of "platt"

platt¹

noun
plural platts
1. Obsolete spelling of plat or plot (scheme, plan, design, map).
  Quotations
  3rdly That it also be recommended to all persons concerned to have their platts passed through the Surveyor Generals Office, and, in all respects, ready for the grant, in case they shall be entitled to the same, by the said 10th of September.
  1794 July 30, minutes of the Executive council of Georgia, published in Minutes of the Executive council, from January 14, 1778, to January 6, 1785 (1908), page 684

platt²

noun
countable and uncountable, plural platts
1. Obsolete spelling of plat (material made by interweaving, especially material made by interweaving straw, used to make hats).
  Quotations
  The versatility of his craftsmanship is likewise evidenced by the inventory which included "8½ Doz. Walking Sticks & Rodds" and "3½ Doz. Straw Hatts, some platt &c." His name appears in several account books of early Philadelphians, in 1751, […]
  c. 1750, a record, quoted in The Pennsylvania Magazine of History and Biography (1931)