thorough-

== English == === Alternative forms === through- (used before a vowel) === Etymology === A variant of through-, common in 16th-19th centuries, particularly where there is a perceived connection with thorough “thorough-”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.. === Prefix === thorough- (no longer productive) through, passing via thoroughfare, thoroughgo, thoroughlane (no longer productive) fully, completely; purely thoroughgoingly, thoroughbreed, thoroughpaced ==== Synonyms ==== (via): dia- (fully): per- ==== Related terms ==== thoroughbrace thoroughpin