(redirected from chemically)
Also found in: Dictionary, Thesaurus, Idioms, Encyclopedia, Wikipedia.
Related to chemically: Chemically Imbalanced


1. pertaining to chemistry.
2. a substance composed of chemical elements, or obtained by chemical processes.


Relating to chemistry.


/chem·i·cal/ (kem´ĭ-k'l)
1. pertaining to chemistry.
2. a substance composed of chemical elements, or obtained by chemical processes.


Etymology: Gk, chemeia, alchemy
1 n, a substance composed of chemical elements or a substance produced by or used in chemical processes.
2 adj, pertaining to chemistry.

Pearl Index

Obstetrics A formula that allows comparison of the efficacy of contraceptive methods, calculated as the pregnancy rate in population divided by 100 yrs of exposure. See Breast feeding, Coitus interruptus, Condoms, Morning-after pill, Contraception, Natural family planning, Norplant, Rhythm method, RU 486.
Pearl index–pregnancies/100 years of use
Physiologic 15-30/100 years: Coitus interruptus, natural family planning (rhythm or safe period), eg calendar method, evaluation of cervical mucosa or temperature, breast feeding
Chemical 15-20/100 years: Contraceptive sponges
Barrier 2-20/100 years: Intrauterine devices, condoms
Hormonal 1-3/100 years
Surgical << 1/100 years: Ligation of fallopian tubes, vas deferens  


Relating to chemistry.


1. pertaining to chemistry.
2. a substance composed of chemical elements, or obtained by chemical processes. See also toxin.

chemical adjuvant
a chemical added to another to improve its activity. For example, mineral gels added to vaccines. May also be a chemical added to feed to improve digestion, e.g. monensin in ruminants. These are more commonly referred to as additives. See also adjuvant.
agricultural chemical
chemical used in agriculture. Includes pesticides, anthelmintics, fertilizers, algaecides, herbicides, soil fumigants and the like.
chemical environment
that part of the animals' environment that is composed of chemicals. For farm livestock this includes fertilizers, defoliants, worm drenches, insect sprays, adjuvants to feed. For companion animals see household chemical (below).
household chemical
the roster of chemicals that one can expect to find in the average household. Includes insect sprays and repellents, snail bait, rodenticide, garden sprays, human medicines and the like.
chemical pneumonitis
results from aspiration of gastric acids.
chemical senses
see olfaction (2), taste.
chemical shearing
causing the fleece of sheep to be shed by the administration of a chemical substance to the sheep. Cyclophosphamide and mimosine have been used experimentally but there is no commercially available system.
chemical spoilage
occurs in preserved foods, especially canned ones. Is usually the result of interaction between the contents and an imperfect container. There may be gas produced, e.g. hydrogen swells, or discoloration of the tin.
chemical warfare
agents used include: (1) systemic poisons, e.g. hydrocyanic acid; (2) lung irritants, e.g. chlorine, phosgene; (3) lacrimators (weeping stimulators), e.g. CN, CAP, CS; (4) sternutators (sneeze stimulators); (5) vesicants, e.g. mustards, nitrogen mustards, arsenic mustards and nettle gases; (6) nerve gases, e.g. organophosphorus compounds.

Patient discussion about chemical

Q. How do you know when depression is chemical or situational? I've been feeling frustrated lately and while I think I show some signs of depression I think it is more a feeling down because of recent changes in my life. Every time I have seen a professional they all want to start me on some drug and having really seen no improvement over the years I swore off them years ago. When is it depression or "My life sucks right now"?

A. Thank you Johanna for sharing this with us.

Q. ADHD medications work on these brain chemicals? Hope you all know about the different types of brain chemicals, so the ADHD medications work on these brain chemicals?

A. Yes Alexzander. The active ingredients in the common ADHD medications are amphetamines. The amphetamines artificially increase the amount of certain neurotransmitters in the brain, speeding up the brain (thus the term “speed” for amphetamines). This makes the frontal area more active, at least while the drug is acting.

Q. How do you tell the difference between chemical burns, and burns from fire? Please don't spare on gross words i would like to know everything there is to burns.

A. Here is a ton of info on both-

More discussions about chemical
References in periodicals archive ?
The chemically dependent adolescents were diagnosed as having a primary substance dependence disorder based upon DSM-IV guidelines.
A growing body of evidence suggests that localized, sustainable food production systems can feed the world without the inherent risks of a worldwide agri-monoculture, chemically dependent on U.
Gutowski says, "The trick is that one functional end of the graft chemical is reactive with appropriate attachment sites of the oxidized polymer surface, while the other functional group on the same graft chemical is chemically reactive with the material to be put in contact with the SICOR-treated surface.
Margarines are currently manufactured from vegetable oils that have been chemically processed by hydrogenation to increase the level of saturated fatty acids in the oil in order to provide margarine its texture and consistency.
In fact, we are particularly interested in g aining separate categories for spunbonded and melt blown nonwovens, as well as separate categories for chemically bonded and air laid nonwovens.
Since that trial, a growing body of research has revealed that the practice of chemically matching bullets is seriously flawed.
The research determined that all chemically bonded sand systems tested showed the same relative amount of thermal distortion where the pressure was 1.
Not tested on animals and easy on the chemically sensitive, it comes in 16- and 32-ounce bottles ($5.
Water-based antistick coatings are said to be thermally stable, chemically inert, environmentally and operator friendly.
Moreover, cows nourished on fodder grown in composted soil were healthier than cows that grazed on chemically grown feed.
Sillum-200 Q/P is a noncombustible, chemically stable, inert alumina silicate, which is processed to eliminate any organic tramp elements that could modify performance.
The hospital specializes in treating chemically dependent adults and adolescents.

Full browser ?