1. The cup of the acorn, husk of the filbert, &c.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• cuppola,
• coppula,
• copula,
• cupola,
• kupola,
• kapula,
• xupula,
• vupula,
• fupula,
• dupula,
• chpula,
• cjpula,
• c8pula,
• c7pula,
• cuoula,
• culula,
• cu-ula,
• cu0ula,
• cupoula,
• cupulla

The plural of the "cupula" can be the "cupulae".

The singular of the "cupula" can be the "cupula".