different between imbase vs rimbase

English

imbase (third-person singular simple present imbases, present participle imbasing, simple past and past participle imbased)

Obsolete spelling of embase (“to lower”)
- 1659, John Hales, Golden Remains of the Ever Memorable Mr. John Hales
  by ambitiously heaping up the conceits and authorities of other men, increase much in the bulk, but do as much imbase in true value

imbase in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

rim +? base

rimbase (plural rimbases)

(military, historical) A short cylinder connecting a trunnion with the body of a cannon.

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