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- (US) Initialism of Grand Army of the Republic.
- 1968, Charles Portis, True Grit:
- He was a Yankee and they say he would not hang a man who had been in the G.A.R.
GAR (plural GARs)
- (biochemistry) Initialism of glycineamide ribonucleotide.
- (biochemistry) Initialism of glutathione amide reductase.