– noun:

[MEY-ner]

Definition:

1. a stolen article found on the person of or near the thief: to be taken with the mainour.

Examples:

1. Caught the thief, with the mainour, hey?

– Maria Edgeworth, the Parent’s Assistant

2. …if I be taken with the mainour, if the theft be found about me, I shall either be killed, or carted with a paper crown set upon my head, having my fault written in great text-letters.

– Fernando de Rojas, The Celestina

[From Dictionary.com]