Derive

Pronunciation:
\di-ˈrīv, dē-\

Definition:
1a : to take, receive, or obtain especially from a specified source
b : to obtain (a chemical substance) actually or theoretically from a parent substance

Etymology:
Middle English, from Anglo-French deriver, from Latin derivare, literally, to draw off (water), from de- + rivus stream — more at run

First Known Use: 14th century

This word sprang up today from the "Ask the Editor" video on Merriam-Webster's website. The word was "gridiron" in honor of football season, and the editor used derivation, a form of derive: "The line of derivation isn't quite so straight."
 
She was talking about the origin of the word gridiron as derived from a 13th century torture device called a gridrion (where we derive the word "griddle" - you can imagine what the nature of this torture was). Sound appropriate? This is where the editor cautions that it's not quite as it seems, since the true reason for calling a football field a gridiron is not because it is a tortuous sport, but because the lines on the field resemble a cooking grate.
 
A slight deviation in the derivation. (tee hee)