Alternative form of letterbox

Tropical duckweed, water lettuce (Pistia stratiotes).

An item of mail that cannot be delivered to its intended recipient; after some time it is returned to the sender, or destroyed. / A law or other measure that is no longer enforced.

(slang) Let you.

An agreement, specifically a legally binding contract, reached by the parties' exchange of letters.

plural of cover letter

(idiomatic) A list of abbreviations, separated by commas, representing the academic qualifications and civil or military honours achieved by a person

plural of letdown

Not capable of causing death. / Designed to cause incapacitation without causing death.

Any weapon that incapacitates without causing death.