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Webster 1913 Edition

Adj.

Having at the bottom, or as a bottom; resting upon a bottom; grounded; – mostly, in composition;

as, sharp-

bottomed

; well-

bottomed

pp.

Furnished with a bottom; having a bottom

This word is often used in composition, as a flat-bottomed boat, in which case the compound becomes an adjective.

bottomed ‎(not comparable)

(in combination) Having some specified type of bottom
- 1934, George Orwell, Burmese Days, Chapter 3,
  It was furnished with long, cane-bottomed chairs made in the jail […]

bottomed