Middle English Dictionary Entry

instrū̆ment n.
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Entry Info

Definitions (Senses and Subsenses)

1.
(a) A device operated by hand, a tool, an implement, a utensil; (b) a musical instrument; (c) a surgical instrument; (d) an instrument used in astronomy or astrology; (e) a weapon; also, a siege engine for attack or defense; place of instrumentes, an armory; also, a storage place for tools or utensils of any kind; (f) misc. uses: a wooden tower or framework; in pl.: the tackle of a ship; fishing gear.
2.
(a) A part or organ of the body performing a certain function; esp. an organ as the tool of one of the senses, of a mental faculty, etc.; the body or part of the body as an instrument of the soul; (b) one of the five senses as a tool of the imagination, etc.; natural heat as an instrument of nature.
3.
A written document by which formal expression is given to a legal act; a decree, an agreement; a contract, a title deed, etc.; ?also, a formal summons.
4.
(a) A means by which something is done or effected; what is used for the accomplishment of something; (b) a person whose actions are prescribed by another, an agent.

Supplemental Materials (draft)

Note: Med., etc., see further J.Norri, Dictionary of Medical Vocabulary, s.v. instrument.