American Heritage Dictionary
(1)
Century Dictionary
(19)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
She told in-PharmaTechnologist that the firm had been approached by an industrial customer asking for a platform capable of filling and sealing 13mm diameter bottles with 1. 5ml of a liquid diagnostic reagent, an operation that could not be run effectively with existing technology.— in-PharmaTechnologist RSS
Cooking is also set to become less of a hassle to learn and perform, with changes such as reagent-free fires and trainers that will know all the details that were previously only known by books, a dude in Gadgetzan, and Nat Pagle!— WoW.com
ABC reagent was applied (Vectastain Elite ABX Kit, Vector Labs) and developed in diaminobenzidine (DAB).— PLoS ONE Alerts: New Articles
A control dot or line often is included to verify that the colour reagent is functioning properly.— Find Me A Cure
Also lots of reagents have been removed, like rogue poisons and things like light feathers for levitate, removing some reagent-gathering from the game.— Tobold's MMORPG Blog

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You can expect to see this word a few times a year.