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| shell nail | Bronchiectasis with excessive longitudinal curvature of the nail plate and atrophy of the nail bed and underlying bone. (05 Mar 2000) |
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| sinus of nail | sinus unguis |
| Smith-Petersen nail | A flanged nail for pinning a fracture of the neck of the femur. (05 Mar 2000) |
| spoon nail | <clinical sign> Dystrophy of the fingernails, sometimes associated with iron deficiency anaemia, in which they are thin and concave, with the edges raises. Synonym: spoon nail. (15 Nov 1997) |
| nail | 1. <anatomy> The horny scale of plate of epidermis at the end of the fingers and toes of man and many apes. "His nayles like a briddes claws were." (Chaucer) The nails are strictly homologous with hoofs and claws. When compressed, curved, and pointed, they are called talons or claws, and the animal bearing them is said to be unguiculate; when they incase the extremities of the digits they are called hoofs, and the animal is ungulate. 2. <ornithology, zoology> The basal thickened portion of the anterior wings of certain hemiptera. The terminal horny plate on the beak of ducks, and other allied birds. 3. A slender, pointed piece of metal, usually with a head, used for fastening pieces of wood or other material together, by being driven into or through them. The different sorts of nails are named either from the use to which they are applied, from their shape, from their size, or from some other characteristic, as shingle, floor, ship-carpenters', and horseshoe nails, roseheads, diamonds, fourpenny, tenpenny (see Penny), chiselpointed, cut, wrought, or wire nails, etc. 4. A measure of length, being two inches and a quarter, or the sixteenth of a yard. Nail ball, a round projectile with an iron bolt protruding to prevent it from turning in the gun. Nail plate, iron in plates from which cut nails are made. On the nail, in hand; on the spot; immediately; without delay or time of credit; as, to pay money on the nail. "You shall have ten thousand pounds on the nail." . To hit the nail on the head, to hit most effectively; to do or say a thing in the right way. Origin: AS. Naegel, akin to D. Nagel, OS OHG. Nagal, G. Nagel, Icel. Nagl, nail (in sense 1), nagli nail (in sense 3), Sw. Nagel nail (in senses 1 and 3), Dan. Nagle, Goth. Ganagljan to nail, Lith. Nagas nail (in sense 1), Russ. Nogote, L. Unguis, Gr, Skr. Nakha. Source: Websters Dictionary (01 Mar 1998) |
| nail bed | The area of the corium on which the nail rests; it is extremely sensitive and presents numerous longitudinal ridges on its surface. According to some anatomists, the nail bed is the portion covered by the body of the nail, the nail matrix being only the part on which the root of the nail rests. Synonym: matrix unguis, keratogenous membrane, nail matrix, onychostroma. (05 Mar 2000) |
| nail biting | Common form of habitual body manipulation which is an expression of tension. (12 Dec 1998) |
| nail diseases | Diseases of the nail plate and tissues surrounding it. The concept is limited to primates. (12 Dec 1998) |
| nail extension | An obsolete method of extension, by a weight on a nail or pin in the distal fragment of a fracture. (05 Mar 2000) |
| nail fold | The fold of skin overlapping the lateral and proximal margins of the nail. Synonym: vallum unguis, wall of nail. (05 Mar 2000) |
| nail-headed | Having a head like that of a nail; formed so as to resemble the head of a nail. Nail-headed characters, arrowheaded or cuneiform characters. See Arrowheaded. Nail-headed molding, an ornament consisting of a series of low four-sided pyramids resembling the heads of large nails; called also nail-head molding, or nail-head. It is the same as the simplest form of dogtooth. See Dogtooth. Source: Websters Dictionary (01 Mar 1998) |
| nail horn | An obsolete term for overgrown nail. (05 Mar 2000) |
| nail infection, fungal | The most common fungus infection of the nails is onychomycosis. Onychomycosis makes the nails look white and opaque, thickened, and brittle. Older women (perhaps because oestrogen deficiency may increase the risk of infection). And men and women with diabetes or disease of the small blood vessels (peripheral vacscular disease) are at increased risk. Artificial nails (acrylic or wraps ) increase the risk because when an artificial nail is applied, the nail surface is usually abraded with an emery board damaging it, emery boards can carry infection, and. Water can collect under the nail creating a moist, warm environment for fungal growth. Alternative names include tinea unguium and ringworm of the nails. (12 Dec 1998) |
| nail matrix | The area of the corium on which the nail rests; it is extremely sensitive and presents numerous longitudinal ridges on its surface. According to some anatomists, the nail bed is the portion covered by the body of the nail, the nail matrix being only the part on which the root of the nail rests. Synonym: matrix unguis, keratogenous membrane, nail matrix, onychostroma. (05 Mar 2000) |
| nail-patella syndrome | <radiology> Fong syndrome, hereditary arthrodysplasia, J.W. Turner syndrome, autosomal dominant Features: abnormal fingernails, absent/hypoplastic patella, defects in radial head, iliac horns (bony processes along posterior surfaces of iliac bones), discoloration of iris (12 Dec 1998) |