Therein is valid Scrabble Word

Is therein a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is therein valid Words with Friends?
Words with Friends YES

Definitions for THEREIN in dictionary:

How to use THEREIN in a sentence

Find what other words can be done using letters: "therein"
https://scrabble-word.com/finder/therein
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