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1.
DMR
Designated Marksman's Rifle

Any battle-ready rifle that has been outfitted with marksman's equipment. Scopes, bipods, composite frames and such.
I trained for my Scout Sniper position with an M14 DMR.
by Michael_Borealis January 29, 2009
 
2.
DMR
The new weapon in Halo: Reach that will replace te BR (battle riffle). This weapon is going to be single fire unlike the Br
R which fired three round bursts.
Ah,sweet, the DMR in this game is beastly
by Yung Swagg7 April 14, 2010
 
3.
DMR
A wonderful young lady that loves RCP. Can also mean Frankie, Dr. Marie, Honey, ect, ect.
"Hey, look at that DMR, she's so great.. Don't ya just love her?"
by slide April 25, 2004