The Collaborative International Dictionary of English v.0.48:
Mail \Mail\ (m[=a]l), n. [OE. male bag, OF. male, F. malle bag,
trunk, mail, OHG. malaha, malha, wallet; akin to D. maal,
male; cf. Gael. & Ir. mala, Gr. molgo`s hide, skin.]
1. A bag; a wallet. [Obs.] --Chaucer.
2. The bag or bags with the letters, papers, or other matter
contained therein, conveyed under public authority from
one post office to another; the whole system of appliances
used by government in the conveyance and delivery of mail
There is a mail come in to-day, with letters dated
3. That which comes in the mail; letters, etc., received
through the post office.
4. A trunk, box, or bag, in which clothing, etc., may be
carried. [Obs.] --Sir W. Scott.
Mail catcher, an iron rod, or other contrivance, attached
to a railroad car for catching a mail bag while the train
is in motion.
Mail guard, an officer whose duty it is to guard the public
Mail train, a railroad train carrying the mail.