| letter | Written or printed communication between individuals or between persons and representatives of corporate bodies. The correspondence may be personal or professional. In medical and other scientific publications the letter is usually from one or more authors to the editor of the journal or book publishing the item being commented upon or discussed. Letter as a publication type is often accompanied by comment. (12 Dec 1998) |
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| letter blindness | Visual agnosia for letters. The subject sees the letters but cannot identify them; caused by a lesion in the occipital cortex. (05 Mar 2000) |
| lettered | 1. Literate; educated; versed in literature. " Are you not lettered?" "The unlettered barbarians willingly accepted the aid of the lettered clergy, still chiefly of Roman birth, to reduce to writing the institutes of their forefathers." (Milman) 2. Of or pertaining to learning or literature; learned. " A lettered education." 3. Inscribed or stamped with letters. Source: Websters Dictionary (01 Mar 1998) |
| Letterer, Erich | <person> German pathologist, *1895. See: Letterer-Siwe disease. (05 Mar 2000) |
| letterer-siwe disease | A condition marked by the abnormal appearance of histiocytes (macrophages) in the blood. Lipid h., Niemann-Pick disease. Sinus h., a disorder of the lymph nodes in which the distended sinuses are completely or nearly completely, filled by histiocytes, as a result of active multiplication of the littoral cells. H. X, a generic term embracing eosinophilic granuloma, Letterer-Siwe disease and Hand-Schuller-Christian disease and indicating a shared common origin for the three entities. (16 Dec 1997) |
| letterwood | <botany> The beautiful and highly elastic wood of a tree of the genus Brosimum (B. Aubletii), found in Guiana; so called from black spots in it which bear some resemblance to hieroglyphics; also called snakewood, and leopardwood. It is much used for bows and for walking sticks. Source: Websters Dictionary (01 Mar 1998) |
| sea letter | The customary certificate of national character which neutral merchant vessels are bound to carry in time of war; a passport for a vessel and cargo. Source: Websters Dictionary (01 Mar 1998) |
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| test letter | See: test types. (05 Mar 2000) |