Is “Whereby” a Scrabble word?
Yes
WHEREBY
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 Whereby
/wɛə(ɹ)ˈbaɪ/
adverb
1.(interrogative) By what, in which direction; how.
“Whereby goest thou?”
2.By which.
3.Where, wherein, in which.