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Webster 1913 Edition

Noun.

[L.

effossio

. See

A digging out or up.

[R.]

“The effossion of coins.”

Arbuthnot.

Noun.

[L. effossus, from effodio, to dig out.] The act of digging out of the earth; as the effossion of coins.

effossion ‎(uncountable)

(archaic) A digging out or up.
- Arbuthnot
  the effossion of coins
- 1818, Edward Daniel Clarke, Travels in Various Countries of Europe, Asia and Africa
  We shall now detail the whole process for the reduction of the ore, from the first moment of its effossion, until the developement of the precious metals […]