platt

Etymology 1

From Early Modern English platte, a variation (probably dialectal) of plot (“plot of land”); see plat and plot for more.

noun

1. Obsolete spelling of plat or plot (scheme, plan, design, map).
   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

Etymology 2

From Middle English platten, whence also plait; see plat.

noun

1. Obsolete spelling of plat (material made by interweaving, especially material made by interweaving straw, used to make hats).
   straw platt
   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)