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letterman a male student who has earned a letter for proficiency in a sport.
letter of credit a letter from a bank authorizing the bearer to withdraw specified sums of money, usu. from other banks, finance houses, or agencies, to be charged to the bank that issued the letter.
letter of marque formerly, a government document that authorized a ship captain to seize the ships of other nations.
letter opener a knifelike tool used to open sealed envelopes.
letter-perfect correct or accurate in every detail.
letterpress a method of printing characters from raised type as opposed to flat or intaglio plates or blocks. [2 definitions]
letters patent a government-issued document granting a person a patent or exclusive right to sell or otherwise profit from an invention or process.
let the cat out of the bag to reveal a secret.
Lettish Latvian.
lettuce any of several varieties of a common, edible annual plant that has large, crisp leaves. [2 definitions]
letup a stop, pause, or momentary relief. [2 definitions]
let up to cease or diminish.
leu the chief monetary unit of Rumania, equaling one hundred bani.
leuco- variant of leuko-.
leukemia any of a group of cancers of bone marrow, usu. resulting in an abnormally high production of white blood cells.
leuko- white; colorless.
leukocyte one of the white or colorless blood cells that normally function to defend the body from infection.
leukocytosis a large temporary increase in the number of white blood cells in the blood, due esp. to infection or pregnancy rather than leukemia.
leukoderma a lack of skin pigmentation, either total or partial, that results in white patches.
leukoma a dense white opacity of the cornea, caused by infection or injury.
lev the chief monetary unit of Bulgaria, equaling one hundred stotinki.