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action stations
action to quiet title
actionable
actioner
activate
activated alumina
activated carbon
activated sludge
activation energy
active
active asset
active cell
active duty
active immunity
active-lifestyle wagon
active list
active listening
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active site
ac·tive site (plural ac·tive sites)


noun 
Definition:
 
reacting part of enzyme or antibody: the part of an enzyme molecule that binds the substance the enzyme acts on substrate
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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