pouch-shell |
<zoology> A small British and American pond snail (Bulinus hypnorum).
Source: Websters Dictionary
(01 Mar 1998) |
cytotrophoblastic shell |
The external layer of foetally derived trophoblastic cells on the maternal surface of the placenta.
(05 Mar 2000) |
shock, shell |
The World War I name for what is known today as posttraumatic stress, this is a psychological disorder that develops in some individuals who have had major traumatic experiences (and, for example, have been in a serious accident or through a war). The person is typically numb at first but later has symptoms including depression, excessive irritability, guilt (for having survived while others died), recurrent nightmares, flashbacks to the traumatic scene, and overreactions to sudden noises. Posttraumatic stress became known as such in the 70s due to the adjustment problems of some vietnam veterans.shots, allergy: known medically as allergy desensitization or allergy immunotherapy, the injections are designed to stimulate the immune system with gradually increasing doses of the substances to which a person is allergic, the aim being to modify or stop the allergy war (by reducing the strength of the IgE and its effect on the mast cells). This form of treatment is very effective for allergies to pollen, mites, cats, and especially stinging insects (e.g., bees, hornets, yellowjackets, wasps, velvet ants, fire ants). Allergy immunotherapy usually takes 6 months to a year to become effective and injections are usually required for 3-5 years.
(12 Dec 1998) |
slit-shell |
<zoology> Any species of Pleurotomaria, a genus of beautiful, pearly, spiral gastropod shells having a deep slit in the outer lip. Many fossil species are known, and a few living ones are found in deep water in tropical seas.
Source: Websters Dictionary
(01 Mar 1998) |
spur-shell |
<zoology> Any one of several species of handsome gastropod shells of the genus Trochus, or Imperator. The shell is conical, with the margin toothed somewhat like the rowel of a spur.
Source: Websters Dictionary
(01 Mar 1998) |
diffusion shell |
A small vessel made of a semipermeable membrane through which peptone, but not serum albumin, can pass; used in performing the Abderhalden test.
(05 Mar 2000) |
ioqua shell |
<zoology> The shell of a large Dentalium (D. Pretiosum), formerly used as shell money, and for ornaments, by the Indians of the west coast of North America.
Origin: From the native name.
Source: Websters Dictionary
(01 Mar 1998) |
ear-shell |
<zoology> A flattened marine univalve shell of the genus Haliotis.
Synonym: sea-ear. See Abalone.
Source: Websters Dictionary
(01 Mar 1998) |
egg shell nail |
Thinning of nails resulting in bending and breaking of the free edge, with longitudinal fissures.
Synonym: egg shell nail.
Origin: hapalo-+ G. Onyx (onych-), nail
(05 Mar 2000) |
top-shell |
<zoology> Any one of numerous species of marine top_shaped shells of the genus Thochus, or family Trochidae.
Source: Websters Dictionary
(01 Mar 1998) |
trough-shell |
<zoology> Any bivalve shell of the genus Mactra. See Mactra.
Source: Websters Dictionary
(01 Mar 1998) |
tube-shell |
<zoology> Any bivalve mollusk which secretes a shelly tube around its siphon, as the watering-shell.
Source: Websters Dictionary
(01 Mar 1998) |
tulip-shell |
<zoology> A large, handsomely coloured, marine univalve shell (Fasciolaria tulipa) native of the Southern United States. The name is sometimes applied also to other species of Fasciolaria.
Source: Websters Dictionary
(01 Mar 1998) |
turban-shell |
<zoology> A sea urchin when deprived of its spines; popularly so called from a fancied resemblance to a turban.
Source: Websters Dictionary
(01 Mar 1998) |
turnip-shell |
<zoology> Any one of several large, thick, spiral marine shells belonging to Rapa and allied genera, somewhat turnip-shaped.
Source: Websters Dictionary
(01 Mar 1998) |