1. A compound yielding a hydrogen ion in a polar solvent ( e.g., in water); acids form salts by replacing all or part of the ionizable hydrogen with an electropositive element or radical. 2. In popular language, any chemical compound that has a sour taste (given by the hydrogen ion). 3. Sour; sharp to the taste. 4. Relating to a.; giving an a. reaction. For individual acids, see specific names. [L. acidus, sour]
- bile acids steroid acids found in bile; e.g., taurocholic and glycocholic acids, used therapeutically when biliary secretion is inadequate and for biliary colic. Their physiologic roles include fat emulsification. Their synthesis is reduced in disorders of the peroxisomes.
- Brøonsted a. an a. that is a proton donor.
- conjugate a. the protonated compound of two compounds that differ in structure only by the presence of the labile proton.
- dibasic a. an a. containing two ionizable atoms of hydrogen in the molecule. See a. (1).
- fatty a. fatty a..
- inorganic a. an a. made up of molecules not containing organic radicals; e.g., HCl, H2SO4, H3PO4.
- Lewis a. an a. that is an electron pair acceptor.
- monobasic a. an a. containing one ionizable atom of hydrogen in the molecule. See a. (1).
- organic a. an a. made up of molecules containing organic radicals; e.g., acetic a., citric a., which contain the ionizable —COOH group.
- polybasic a. an a. containing more than three ionizable atoms of hydrogen in the molecule. See a. (1).
- wax a. a long-chain monocarboxylic a. with an even number of carbons, often found esterified in waxes ( e.g., lauric a.).
* * *
Arithmetic, Coding, Information, and Digit Span

* * *

ac·id 'as-əd adj
1) sour, sharp, or biting to the taste
2 a) of, relating to, or being an acid also having the reactions or characteristics of an acid <an \acid solution>
b) of salts and esters derived by partial exchange of replaceable hydrogen <\acid sodium carbonate NaHCO3>
c) marked by or resulting from an abnormally high concentration of acid <\acid indigestion> not used technically
acid n
1) a sour substance specif any of various typically water-soluble and sour compounds that in solution are capable of reacting with a base to form a salt, that redden litmus, that have a pH less than 7, and that are hydrogen-containing molecules or ions able to give up a proton to a base or are substances able to accept an unshared pair of electrons from a base
2) LSD

* * *

ac·id (asґid) [L. acidum from acidus sharp, sour] any of a large class of chemical substances defined by three chemical concepts of increasing generality. An Arrhenius acid is a substance that lowers the pH (increases the hydrogen ion concentration) when added to an aqueous solution; such substances have a sour taste, turn litmus red, and react with alkalis to form salts. A Bronsted-Lowry acid is a species that acts as a proton donor in solution; e.g., the ammonium ion (NH4+) can donate a proton, leaving ammonia (NH3); such species are termed conjugate acid-base pairs. A Lewis acid is a species that can accept a pair of electrons to form a covalent bond; e.g., BF3 in the reaction BF3 + NH3 → BF3NH3. Aqueous solutions of certain compounds that dissociate in solution, e.g., hydrogen chloride, are designated acids by names beginning with hydro-, e.g., hydrochloric acid. Most other common inorganic acids are oxo acids (q.v.); common organic acids include carboxylic acids, sulfonic acids, and phenols. The name of the anion formed by the removal of hydrogen from an acid (its conjugate base) and the names of salts and esters of acids are formed by removing the suffix -ic and the word acid and adding the suffix -ate, except for oxo acids ending in -ous, when the suffix is -ite. For particular acids, see the specific name.

Medical dictionary. 2011.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • acid — ACÍD, Ă, acizi, de, s.m., adj. 1. s.m. Substanţă chimică, cu gust acru şi miros înţepător, care înroşeste hârtia albastră de turnesol şi care, în combinaţie cu o bază, formează o sare. 2. adj. (Adesea fig.) Care are proprietăţile unui acid (1),… …   Dicționar Român

  • ACiD — Productions (ACiD) ist eine Scene Artgroup welche sich, 1990 gegründet, ursprünglich auf ANSI Art für Mailboxen spezialisiert hat. In den letzten Jahren fand mit dem Niedergang der Mailbox Szene ein Wechsel zu anderen Hauptaktivitäten wie… …   Deutsch Wikipedia

  • acid — Since the 1960s, when acid was first used to mean the hallucinogenic drug LSD, the word has developed all the connotations of a subculture. Those taking drugs came to be called acid heads or acid freaks; and their way of life came to depend on… …   Modern English usage

  • ACiD — Productions ACiD Productions (ACiD) est un groupe artistique et numérique underground. Fondé en 1990, le groupe était à l origine spécialisé dans le graphisme ANSI pour les BBS. Plus récemment, ils ont étendu leur domaine d application vers d… …   Wikipédia en Français

  • Acid — (англ. «кислота»): В музыке Эйсид хаус, эйсид техно  музыкальные жанры. Acid японская рок группа. Acid бельгийская спид/трэш метал группа. Acid Наркотическое вещество LSD 25. В информатике Sony ACID Pro аудиоредактор ACID набор… …   Википедия

  • acid — [adj1] bitter, sour in taste acerbic, acidulous, biting, piquant, pungent, sharp, tart, vinegarish, vinegary; concept 613 Ant. bland, sweet acid [adj2] having acidic, corrosive properties acerbic, acidulous, acrid, anti alkaline, biting,… …   New thesaurus

  • Acid — Ac id, a. [L. acidus sour, fr. the root ak to be sharp: cf. F. acide. Cf. {Acute}.] 1. Sour, sharp, or biting to the taste; tart; having the taste of vinegar: as, acid fruits or liquors. Also fig.: Sour tempered. [1913 Webster] He was stern and… …   The Collaborative International Dictionary of English

  • Acid — Ac id, n. 1. A sour substance. [1913 Webster] 2. (Chem.) One of a class of compounds, generally but not always distinguished by their sour taste, solubility in water, and reddening of vegetable blue or violet colors. They are also characterized… …   The Collaborative International Dictionary of English

  • acid — (izg. àsid) m DEFINICIJA glazb. podžanr rocka, karakterističan po instrumentalnim improvizacijama, psihodeličnim tekstovima, jakom ritam sekcijom i naglašenim gitarskim zvučnim efektima SINTAGMA acid house (izg. acid hȃus) glazb. podžanr… …   Hrvatski jezični portal

  • acid — [as′id] adj. [L acidus, sour < IE base * ak̑ , sharp, pointed > EAR2] 1. sharp and biting to the taste; sour; tart 2. sharp or sarcastic in temperament or speech 3. that is, or has the properties of, an acid 4. having too heavy a… …   English World dictionary

  • ACID — ACID, deutsch auch AKID, ist eine Abkürzung in der Informatik. Es beschreibt erwünschte Eigenschaften von Verarbeitungsschritten in Datenbankmanagementsystemen (DBMS) und verteilten Systemen. Es steht für Atomicity, Consistency, Isolation und… …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”