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.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.