from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Pertaining to a hat with a high pointed crown.
from the GNU version of the Collaborative International Dictionary of English
- adj. Having a high crown, or a point or peak at top.
from The Century Dictionary and Cyclopedia
- High-crowned; pointed. [Rare.] Also spelled copotain.
Perhaps an alteration of captain. (Wiktionary)
V. i.70 (443,2) [a copatain hat!] is, I believe, a hat with a conical crown, such as was anciently worn by well-dressed men.