demersion
/diˈmɜː(ɹ)ʒən/
noun 2
Definitions
noun
1
The act of plunging into a fluid; a drowning.
2
The state of being overwhelmed in, or as if in, water.
[T]his Sinking and Demerſion of Buildings into the Earth is a manifeſt Sign of their Antiquity, vvhich is ſo much the greater, by hovv much the deeper they are ſunk.
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