Strong's #6783: tsmiythuth (pronounced tsem-ee-thooth')

or tsmithuth {tsem-ee-thooth'}; from 6789; excision, i.e. destruction; used only (adverbially) with prepositional prefix to extinction, i.e. perpetually:--ever.

Brown-Driver-Briggs Hebrew Lexicon:

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tsemı̂ythûth / tsemithûth

1) completion, finality, in perpetuity

Part of Speech: noun feminine

Relation: from H6789

Usage:

This word is used 2 times:

 

Leviticus 25:23: "The land shall not be sold forever: for the land is mine; for ye"
Leviticus 25:30: "is in the walled city shall be established forever to him that bought it throughout his generations: it shall not"