Etymology
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dipstick (n.)

"rod for measuring the depth of a liquid" (originally and especially the oil in a motor engine), 1927; see dip (v.) + stick (n.). For slang "penis" sense, see dip (n.2).

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Definitions of dipstick

dipstick (n.)
a graduated rod dipped into a container to indicate the fluid level;
From wordnet.princeton.edu