different between roundlet vs rundlet

English

From Middle English roundelet, from Middle French rondelet, a diminutive of rondel (“small circle”).

roundlet (plural roundlets)

rundlet (plural rundlets)

A small barrel of no certain dimensions, which may contain from 3 to 20 gallons.
A measure for liquids, as for wine, usually 18.5 gallons.
- 1882, James Edwin Thorold Rogers, A History of Agriculture and Prices in England, p. 205:
  Again, by 28 Hen. VIII, cap. 14, it is re-enacted that the tun of wine should contain 252 gallons, a butt of Malmsey 126 gallons, a pipe 126 gallons, a tercian or puncheon 84 gallons, a hogshead 63 gallons, a tierce 41 gallons, a barrel 31.5 gallons, a rundlet 18.5 gallons.

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