derrick

Concise Oxford English Dictionary © 2008 Oxford University Press:
derrick /ˈdɛrɪk/

▶noun

• 1 a kind of crane with a movable pivoted arm.

• 2 the framework over an oil well, holding the drilling machinery.

– origin C17 (denoting a hangman, also the gallows): from Derrick, the surname of a London hangman.