| hard tarter | <dentistry> A calcium salt concretion which forms on your teeth. Calculus deposits form on the teeth in areas which you do not floss or brush. If these concretions are left to build up on the tooth enamel, they will irritate the gum tissue, push it away from the tooth and promote progressive bone loss. Eventually the teeth can loosen and fall out. These deposits can be removed by a dentist or a dental hygienist on an annual to biannual basis. (27 Sep 1997) |
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| hard tissue | Tissue that has become mineralised, tissue having a firm intercellular substance, e.g., cartilage and bone. (05 Mar 2000) |
| hard tubercle | A tubercle lacking necrosis. (05 Mar 2000) |
| hard ulcer | <dermatology> The primary skin lesion of syphilis which begins at the site of infection after an interval of 10-30 days as a papule or red ulcerated skin lesion. (27 Sep 1997) |
| hard water | <chemistry> Hard water is water which contains minerals like calcium carbonate, magnesium carbonate, bicarbonates, sulphates, or chlorides, because it has been exposed to rocks or rocky soils. Hard water can corrode, discolour, or deposit its minerals, in and around materials such as water pipes. (09 Oct 1997) |
| hard-hearted | Unsympathetic; inexorable; cruel; pitiless. Hard"-heartedness. Source: Websters Dictionary (01 Mar 1998) |
| hardbeam | <botany> A tree of the genus Carpinus, of compact, horny texture; hornbeam. Source: Websters Dictionary (01 Mar 1998) |
| harden | 1. To make hard or harder; to make firm or compact; to indurate; as, to harden clay or iron. 2. To accustom by labour or suffering to endure with constancy; to strengthen; to stiffen; to inure; also, to confirm in wickedness or shame; to make unimpressionable. "Harden not your heart." "I would harden myself in sorrow." (Job vi. 10) Origin: OE. Hardnen, hardenen. Source: Websters Dictionary (01 Mar 1998) |
| Harden-Young ester | D-fructose 1,6-bisphosphate;important intermediate in sugar metabolism. (05 Mar 2000) |
| hardened pelvis | A condition in which the true pelvis is indurated throughout, especially by carcinoma. Synonym: hardened pelvis. (05 Mar 2000) |
| harder | <zoology> A South African mullet, salted for food. Source: Websters Dictionary (01 Mar 1998) |
| harderian | <anatomy> A term applied to a lachrymal gland on the inner side of the orbit of many animals which have a third eyelid, or nictitating membrane. See Nictitating membrane, under Nictitate. Source: Websters Dictionary (01 Mar 1998) |
| harderian gland | A sebaceous gland that, in some animals, acts as an accessory to the lacrimal gland. The harderian gland excretes fluid that facilitates movement of the third eyelid. (12 Dec 1998) |
| hardfern | <botany> A species of fern (Lomaria borealis), growing in Europe and Northwestern America. Source: Websters Dictionary (01 Mar 1998) |
| hardhack | <botany> A very astringent shrub (Spiraea tomentosa), common in pastures. The Potentilla fruticosa in also called by this name. Source: Websters Dictionary (01 Mar 1998) |