(thûr′ō, thûr′ə) adjective
1. Carried to completion; thoroughgoing: a thorough search; also, carrying (a task) to completion; persevering: a very thorough worker.
2. Marked by careful attention throughout; not superficial; hence, complete; perfect.
3. Completely (such and such); through and through: a thorough nincompoop.
4. Painstakingly conforming to a standard.
5. Obs. Going or passing through. See synonyms under RADICAL.
—adverb & prep. Obs. Through. Also Obs. thor′o. [Emphatic var. of THROUGH]
—thor′ough·ly adverb
—thor′ough·ness noun

(thûr′ō) noun
The administrative policy of Charles I's minister, the Earl of Strafford: so called by himself as being a method of carrying through his ideas in spite of all opposition.