Real Dictionary

extract
verb: If you extract something from a place, you take it out or pull it out.
verb: If you say that someone extracts something, you disapprove of them because they take it for themselves to gain an advantage.
verb: To extract a substance means to obtain it from something else, for example by using industrial or chemical processes.
verb: When a dentist extracts a tooth, they remove it from the patient's mouth.

extract in American English
to draw out by effort; pull out
noun: something extracted
transitive verb: to get, pull, or draw out, usually with special effort, skill, or force

extract in British English
noun: something extracted, such as a part or passage from a book, speech, etc
verb: to withdraw, pull out, or uproot by force

extract in Chemical Engineering
noun: An extract is the output from a liquid-liquid extraction process, mainly containing the solvent used to extract the solute.

extract in the Pharmaceutical Industry
noun: An extract is a solution of plant or animal tissue containing the active ingredient.