| Helmholtz theory of colour vision | A theory that there are three colour-perceiving elements in the retina: red, green, and blue. Perception of other colours arises from the combined stimulation of these elements; deficiency or absence of any one of these elements results in inability to perceive that colour and a misperception of any other colour of which it forms a part. Synonym: Helmholtz theory of colour vision. (05 Mar 2000) |
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| Helmholtz theory of hearing | That the basilar membrane of the cochlea acts as a resonating structure, recording low tones from its apical turns and high tones from its basal turns. Synonym: Helmholtz theory of hearing. (05 Mar 2000) |
| Helmholtz' axis ligament | <anatomy> A ligament forming the axis about which the malleus rotates; it consists of two portions extending from the anterior and the posterior border, respectively, of the tympanic notch to the malleus. Synonym: axis ligament of malleus. (05 Mar 2000) |
| Helmholtz, Hermann von | <person> German physician, physicist, and physiologist, 1821-1894. See: Helmholtz' axis ligament, Helmholtz energy, Helmholtz theory of accommodation, Helmholtz theory of colour vision, Helmholtz theory of hearing, Helmholtz-Gibbs theory, Gibbs-Helmholtz equation, Young-Helmholtz theory of colour vision. (05 Mar 2000) |
| Helmholtz-Gibbs theory | An equation expressing the relationship in a galvanic cell between the chemical energy transformed and the maximal electromotive force obtainable. (05 Mar 2000) |
| helminth | Any parasitic worm, though it usually refers to one living in the intestines of a vertebrate animal. (09 Oct 1997) |
| helminth proteins | Proteins found in any species of helminth. (12 Dec 1998) |
| helminthagogue | <medicine> A vermifuge. Origin: Gr. A worm + to drive. Source: Websters Dictionary (01 Mar 1998) |
| helminthemesis | The vomiting or expulsion through the mouth of intestinal worms. Origin: G. Helmins, a worm, + emesis, vomiting (05 Mar 2000) |
| helminthes | <zoology> One of the grand divisions or branches of the animal kingdom. It is a large group including a vast number of species, most of which are parasitic. Synonym: Enthelminthes, Enthelmintha. The following classes are included, with others of less importance: Cestoidea (tapeworms), Trematodea (flukes, etc), Turbellaria (planarians), Acanthocephala (thornheads), Nematoidea (roundworms, trichina, gordius), Nemertina (nemerteans). See Plathelminthes, and Nemathelminthes. Origin: NL, fr. Gr, a worm. Source: Websters Dictionary (01 Mar 1998) |
| helminthiasis | An infection by a parasitic worm (a helminth), which can be in the intestines, under the skin, or in the general area of the gut. (09 Oct 1997) |
| helminthiasis, animal | Infestation of animals with parasitic worms of the helminth class. The infestation may be experimental or veterinary. (12 Dec 1998) |
| helminthic | <pharmacology> An agent that is destructive to worms and used for removing internal parasitic worms in animals and humans. Origin: Gr. Helmins = worm (13 Nov 1997) |
| helminthic dysentery | Dysentery caused by infection with parasitic worms. (05 Mar 2000) |
| helminthism | An infection by a parasitic worm (a helminth), which can be in the intestines, under the skin, or in the general area of the gut. (09 Oct 1997) |