| hard rays | Ray's of short wavelength and great penetrability. (05 Mar 2000) |
|---|---|
| hard science | A field of scientific study which involves precise measurements of observations and well-defined methods for obtaining and interpreting new knowledge. Chemistry and physics are definitely hard sciences, biology, geology, and astronomy also are usually thought of as hard sciences. Psychology, sociology, and anthropology are not, and are considered soft sciences. (09 Oct 1997) |
| hard soap | A soap made with olive oil, or some other suitable oil or fat, and sodium hydroxide; used as a detergent, and in the form of a suppository or soapsuds enema for constipation; used also as an excipient in pills. Synonym: Castile soap. (05 Mar 2000) |
| hard sore | 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 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) |
| 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) |
| human measles immune serum | Obtained from the blood of a healthy person who has survived an attack of measles. Synonym: measles convalescent serum. (05 Mar 2000) |
| immunization, german measles | See Immunization, MMR. (12 Dec 1998) |
| immunization, measles | See Immunization, MMR. (12 Dec 1998) |
| three-day measles | <disease, virology> An acute, usually benign, infectious disease caused by a togavirus and most often affecting children and nonimmune young adults, in which the virus enters the respiratory tract via droplet nuclei and spreads to the lymphatic system. It is characterised by a slight cold, sore throat and fever, followed by enlargement of the postauricular, suboccipital and cervical lymph nodes and the appearances of a fine pink rash that begins on the head and spreads to become generalised. Synonym: German measles, rubeola. Origin: L. Rubellus = reddish, ruber = red (17 Dec 1997) |
| tropical measles | <infectious disease, virology> A disease of uncertain character, somewhat resembling rubella, occurring in southern China. (05 Mar 2000) |