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Key

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Ernst A.H., Swedish anatomist and physician, 1832-1901. See: foramen of Key-Retzius, sheath of Key and Retzius.
Farlex Partner Medical Dictionary © Farlex 2012

key

a character of special significance in an organism. Such characters are used in a system for determining the identity of an organism on the basis of the presence or absence of a succession of characters. Usually such keys are DICHOTOMOUS (2); that is to say, at each step there is a choice between two possibilities. Keys, however, may have more than two characters at each step and there is a gradual elimination of absent characters until identification is made.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Key ins: Brett Holman (AZ Alkmaar), Karim El Ahmadi (Feyenoord), Matthew Lowton (Sheffield United), Ron Vlaar (Feyenoord).
Key ins: Marko Marin (Werder Bremen), Eden Hazard (Lille), Oscar (Internacional).
Key ins: Steven Naismith (Rangers), Steven Pienaar (Tottenham).
Coach:Terry Matterson (Nov 05) Last season: 7th Key ins: Paul Jackson, Steve Snitch Outs: Chris Feather, Ryan Boyle Prospects: Tigers did well to reach the play-offs last season, but will find it difficult to frighten in 2010.
Coach: Kevin Walters Last season: 8th Key ins: Dallas Johnson, Setaimata Sa, Chris Walker Outs: Greg Bird, Jason Ryles, Jason Croker, Justin Murphy, Shane Perry Prospects: Greg Bird's return to Oz will take fire out of Dragons' belly, but they'll be in play-off running.