Is “Thenceforth” a Scrabble word?
Yes
THENCEFORTH
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Thenceforth
adverb
1.From that time on.
Synonyms: thenceforward, thenceforwards