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ABCDEFGHIJKLMNOPQRSTUVWXYZ
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actor
actress
Acts of the Apostles
ACTT
actual
actual cash value
actual turnover
actualise
actuality
actualize
actually
actuarial
actuarial science
actuary
actuate
ACU
acuity
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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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