Vex·il·lum n.; pl. Vexilla
1. Rom. Antiq. (a) A flag or standard. (b) A company of troops serving under one standard.
2. Eccl. (a) A banner. (b) The sign of the cross.
3. Bot. The upper petal of a papilionaceous flower; the standard.
4. Zool. The rhachis and web of a feather taken together; the vane.
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