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[2x]
: MÜ Mä Mæ Mé Mê Mö Mœ M- M. M1 M2 M3 M< Ma Mb Mc Md Me Mf Mg Mh Mi Mk Ml Mm Mn Mo Mp Mr Ms Mt Mu Mv Mw Mx My
mail slot
CIDE DICTIONARY
mail slot, n.
A usually horizontal slot in a door through which mail can be delivered. It often has a hinged cover to keep the opening cloised when not in use. [WordNet 1.5]
For further exploring for "mail slot" in Webster Dictionary Online