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acidosis
acidulate
acidulous
aciduria
acierate
acinus
acipimox
ACIS
ack-ack
ack-emma
ackee
Ackerman steering
acknowledge
acknowledgment
aclarubicin
aclinic line
ACLS
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ack-ack
ack-ack [ ák àk, àk ák ] (plural ack-acks)


noun 
Definition:
 
1. arms 
Same as  antiaircraft gun
2. antiaircraft fire: antiaircraft fire
[Representing AA "antiaircraft" in a former system of spelling out messages]
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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