vexillum

‖n.; pl. Vexilla [ L., a standard, a flag. ] 1. (Rom. Antiq.) (a) A flag or standard. (b) A company of troops serving under one standard. [ 1913 Webster ]

2. (Eccl.) (a) A banner. (b) The sign of the cross. [ 1913 Webster ]

3. (Bot.) The upper petal of a papilionaceous flower; the standard. [ 1913 Webster ]

4. (Zool.) The rhachis and web of a feather taken together; the vane. [ 1913 Webster ]