Century Dictionary and Cyclopedia
- In anatomy and physiology, of or pertaining to tears; secreting tears; conveying tears: as, the lacrymal apparatus.
- n. One of the bones of the face in vertebrates; in man, the os unguis, or nail-bone, so called from its resemblance in size and shape to a human finger-nail. It is situated wholly within the orbit of the eye, on the inner side, in relation with the lacrymal or nasal duct, whence the name. In vertebrates other than man it is usually a much larger and stouter bone, situated externally upon the face, commonly forming a part of the bony brim of the orbit. It is essentially a membrane bone, forming one of a series which in some animals constitutes an outer arcade along the side of the skull, over the orbit, approximately parallel with the zygomatic arch. Also called lacrymale, os lacrymale, os unguis, and os tarsale. See cut under
- n. Same as lacrymatory.
- n. plural Tears; a fit of weeping.
- n. In ichthyology:
- n. A bone lateral to the ethmoid in fishes, the prefrontal: not homologous with the bone called ‘lacrvmal’ by Parker.
- n. A bone in front of the eye in fishes, part of the suborbital ring; the preorbital: not homologous with the bone called ‘lacrymal’ by Geoffroy.
- adj. alternative spelling of lachrymal.
GNU Webster's 1913
“That the internal membrane of the nostrils may be kept always moist, for the better perception of odours, there are two canals, that conduct the tears after they have done their office in moistening and cleaning the ball of the eye into a sack, which is called the lacrymal sack; and from which there is a duct, that opens into the nostrils: the aperture of this duct is formed of exquisite sensibility, and when it is stimulated by odorous particles, or by the dryness or coldness of the air, the sack contracts itself, and pours more of its contained moisture on the organ of smell.”
“Old now, with overactive lacrymal glands and hesitant speech, he did not in the least appeal to his present patient.”
“Thence the nerve impulses travel to the lacrymal glands, leading to an increased flow of their secretion.”
“Outside of the eyeball, in the loose, fatty tissue of the orbit, in the upper and outer corner is the lacrymal or tear gland.”
“The apparatus producing this secretion consists of the lacrymal or tear gland and lacrymal canals or tear passages (Fig. 136).”
“The lacrymal canals are at times blocked by inflammation of the nasal duct, and the fluid collects in the corners of the eyelids and overflows down the cheeks, producing much inconvenience.”
“Look in a mirror, and the small lacrymal point, or opening into the nasal duct, may be observed.”
“A, lacrymal canals, with the minute orifices represented as two black dots (puncta lacrymalia) to the right;”
“B, tendon of the orbicularis palpebrarum muscle; apparently under B is seen the lacrymal sac.”
“The lacrymal or tear gland is under the control of the nervous system.”
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