1) Cloth for GI garb 2) Shade at the front 3) Shade of green 4) Tigerstripe precursor 5) Uniform shade 
[n] - a grayish olive or dark olive gray 2. [n] - military uniform of the United States army 3. [n] - a cloth of an olive-brown color used for military uniforms[adj] - of an olive-brown color similar to khaki
olive drab A grayish green color used as a military uniform made of olive drab cloth; especially, one worn in the United States army.
noun military uniform of the United States army; made from cloth of a dull olive colordrab noun a dull greyish to yellowish or light olive browndrab adjective of a light brownish green color