[? f. FLATTER v.2 + DOCK sb.1] A provincial name given to several large-leaved aquatic plants (‘docks’), probably from the floating leaf.
1820. R. Wilbraham, Chesh. Gloss., Flatter Dock or Batter Dock, pond weed, or potamogeton.
1878–86. Britten & Holland, Plant-n. Flatter Dock.
