A dictionary of terms used in medicine and the collateral sciences / by the late Richard D. Hoblyn.

  • Richard Hoblyn
Date:
1892
Catalogue details

Licence: Public Domain Mark

Credit: A dictionary of terms used in medicine and the collateral sciences / by the late Richard D. Hoblyn. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    metal, which is assumed to exist in ammoniacal salts. Ammonium carbonate is a solid compound of am- monia and carbonic anhydride gases. AMNE'SIA (a, priv., ^j'tjo-is, memory). Ohlivio ; memoria deleta, forgetfulness ; loss of memory, especially menioiy of words; a prominent symptom in certain cerebral diseases, &c. See Aphasia. A'MNION {afii'Ss, a sheep). The most internal of the fcetal mem- branes, formed by a folding over the foetus laterally and antero- posteriorly of the epiblast and somatopleural portion of the meso- blast; the folds meet over the embryo and coalesce, leaving no septum at the line of junction, so that there are formed two layers, the outer or false amnion, and the inner or trtte amnion, and between these a cavity continuous with the pleuro-peritoneal space; be- tween the true amnion and the foetus is a second cavity containing the amniotic Jltdd, or liquw amnii. In fishes and amphibia the amnion is absent. The name appears to have been derived from its softness to the touch ; but it is said to have been first observed in the sheep. Dr Greenhili says that the proper term is a/xvfTos x''''^'' or v/J-'nt', and that it is doubtful whether rh a^ivlov, the neuter substantive, is ever used in this sense. AMNIOTIC. Belonging to the amnion. AMCE'BA ((iyuef^a), to change). A monocellular nucleated organism containing a finely granular proto- plasm ; it is constantly changing its form (hence its name) by thrusting out processes of its pro- toplasm. Amahoid movements. Those seen in the white corpuscles of the blood and resembling the movemeuta of the amoeba. AMO'RPHOUS (a, priv., txop(l>i], form). Formless ; irregular ; a term applied to certain sediments found in the urine, in states of disease. See Calcuhcs. AMPERE. The unit of the strength of an electric cuiTcnt. See Volt and Ohm. AMPERE'S LAW. The law that equal volumes of gases or vapours under like conditions contain the same number of mole- cules. Ampere died in 1836. A'MPHI- {afi<pl). A Greek pre- position signifying, in compound words, about, on both sides, on all sides, so that it seems sometimes to stand for 5uo and reminds us of the Latin amho in am&«lexter. 1. Amph-emc'rinos {a/j.^riixepivos, sc. irvpfTds). A Hippocratic term for quotidian fever, an<p\ vfiepa, in the compass of a day. 2. Amph-id Salts {eTSos, like- ness). Salts sup])osed to result from the combination of a base with an acid. They were thus distinguished by Berzelius from haloid salts, which consisted only of a metal and an electro-negative radical or halogen. Thus chloride of sodium would be a haloid salt, while sulphate of soda would be an amphid salt. In modern chemical nomenclature this dis- tinction is not made, the two classes being considered identical; sulphate of soda being formed on the typo of chloride of sodium. ' 3. Amphi-arthrosis {&pepeixris, articulation). A mixed kind of articulation, with obscure motion, partaking of both the movable diar- throsis and the immovable synar- throsis ; it is also called continuous diarthrosis. Examples occur in the connection between the bodies of the vertcbrce, the union of the first two pieces of the sternum, and the
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