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Whereby

//wɛə(ɹ)ˈbaɪ// adv

Adverb

1
By what, in which direction; how. interrogative, not-comparable, obsolete
"Whereby goest thou?"
2
By which. not-comparable
"Shylock: Nay, take my life and all; pardon not that: You take my house when you do take the prop That doth sustain my house; you take my life When you do take the means whereby I live."
3
Where, wherein, in which. nonstandard, not-comparable
"Because COBOL does not have a date type, some implementations rely instead on a system whereby all dates are coded to a reference point. The most commonly used is May 20, 1875, as this was the date of an international standards-setting conference held in Paris, known as the Convention du Mètre."

From where + by.

Unscramble this word: whereby