However, on some occasions that are heavily associated with Advent, such as the Rorate Mass (but not on Sundays), white is used. On the 3rd Sunday of Advent, Gaudete Sunday, rose may be used instead, referencing the rose used on Laetare Sunday, the 4th Sunday of Lent. During the Nativity Fast, red is used by Eastern Christianity, although gold is an alternative color.
fissure. 1. Anatomy a narrow split or groove that divides an organ such as the brain, lung, or liver into lobes. 2. a small unnatural crack in the skin or mucous membrane, as between the toes or at the anus. 3. a minute crack in the surface of a tooth, caused by imperfect joining of enamel during development. [ â²fishÂ·Ér ].
superior orbital fissure An elongated opening lying between the roof and the lateral walls of the orbit, that is, between the two wings of the sphenoid bone. Syn. sphenoidal fissure. See abducens nerve; oculomotor nerve; ophthalmic nerve; trochlear nerve; superior ophthalmic vein; Table O4.nterpalpebral fissure See palpebral aperture. optic fissure An invagination of the inferior portion of the optic stalk of the embryo. The hyaloid vessels pass through that fissure to supply the developing crystalline lens.