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dottrel
dotty
dou-dou
Douai
Douala
Douay Bible
double
double act
double-acting
double agent
double back
double-bank
double bar
double-barreled
double bass
double-bass
double bassoon
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double-acting
dou·ble-act·ing


adjective 
Definition:
 
1. with pistons acting both ways: with one or more pistons that move in both directions, giving two strokes per cycle
2. acting in opposite directions: acting in opposite directions from a central point
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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