mail 2 
(māl)
(māl)n.
1. Flexible armor composed of small overlapping metal rings, loops of chain, or scales.
2. The protective covering of certain animals, as the shell of a turtle.
tr.v. mailed, mail·ing, mails
To cover or armor with mail.
[Middle English maille, from Old French maile, from Latin macula, blemish, mesh of a net.]