| lamellar bone | The normal type of adult mammalian bone, whether cancellous or compact, composed of parallel lamellae in the former and concentric lamellae in the latter; lamellar organization reflects a repeating pattern of collagen fibroarchitecture. (05 Mar 2000) |
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| lamellar cataract | A cataract in which the opacity is limited to the cortex. Synonym: zonular cataract. (05 Mar 2000) |
| lamellar granule | A membrane-bound granule, 100 to 500 nm in diameter, located in the upper layers of the stratum spinosum of certain stratified squamous epithelia. Synonym: lamellar granule, membrane-coating granule, Odland body. (05 Mar 2000) |
| lamellar ichthyosis | A dry form of congenital ichthyosiform erythroderma, an autosomal recessive trait present at birth; characterised by large, coarse scales over most of the body with thickened palms and soles, and associated with ectropion; histologically, there is hyperkeratosis, a prominent granular layer in the epidermis, slight acanthosis, many mitotic figures, and normal or reduced epidermal cell turnover. See: collodion baby, harlequin foetus. (05 Mar 2000) |
| lamellar keratoplasty | Keratoplasty in which only the anterior layer of the cornea is used (not a tectonic keratoplasty). Synonym: lamellar keratoplasty, layered keratoplasty. (05 Mar 2000) |
| lamellar phase | <biochemistry> A lamellar organisation of phospholipids that are packed as a bilayer with hydrophobic acyl tails inwardly directed and polar head groups on the outside surfaces. It is this bilayer that forms the basis of membranes in cells, though in most cellular membranes a very substantial proportion of the area may be occupied by integral proteins. The triple layered appearance of membranes seen in electron microscopy is thought to arise because the osmium tetroxide binds to the polar regions leaving a central, unstained, hydrophobic region. (31 Dec 1997) |
| lamellate | Made up of thin plates or lamina. (09 Oct 1997) |
| lamellated corpuscles | Small oval bodies in the skin of the fingers, in the mesentery, tendons, and elsewhere, formed of concentric layers of connective tissue with a soft core in which the axon of a nerve fibre runs, splitting up into a number of fibrils that terminate in bulbous enlargements; they are sensitive to pressure. Synonym: corpuscula lamellosa, pacinian corpuscles, Vater's corpuscles, Vater-Pacini corpuscles. (05 Mar 2000) |
| lamellibranch | <zoology> One of the Lamellibranchia. Also used adjectively. Source: Websters Dictionary (01 Mar 1998) |
| lamellibranchiata | <zoology> A class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc. They usually have two (rarely but one) flat, lamelliform gills on each side of the body. They have an imperfectly developed head, concealed within the shell, whence they are called Acephala. Synonym: Conchifera, and Pelecypoda. See Bivalve. Origin: NL. See lamella, and Branchia, Branchiate. Source: Websters Dictionary (01 Mar 1998) |
| lamellibranchiate | <zoology> Having lamellar gills; belonging to the Lamellibranchia. One of the Lamellibranchia. Source: Websters Dictionary (01 Mar 1998) |
| lamellicorn | <zoology> Having antennae terminating in a group of flat lamellae; said of certain coleopterous insects. Terminating in a group of flat lamellae; said of antennae. A lamellicorn insect. Origin: Lamella + L. Cornu a horn: cf. F. Lamellicorne. See Lamella. Source: Websters Dictionary (01 Mar 1998) |
| lamellicornia | <zoology> A group of lamellicorn, plant-eating beetles. Synonym: Lamellicornes. Origin: NL. See Lamellicorn. Source: Websters Dictionary (01 Mar 1998) |
| lamellipodium | Flattened projection from the surface of a cell, often associated with locomotion of fibroblasts. (18 Nov 1997) |
| lamellirostral | <zoology> Having a lamellate bill, as ducks and geese. Origin: Lamella + rostral: cf. F. Lamellirostre. Source: Websters Dictionary (01 Mar 1998) |