Definition of 'penicillin'


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1. pharmacology Any of a group of broad-spectrum antibiotics obtained from Penicillium molds or synthesized; they have a beta-lactam structure; most are active against gram-positive bacteria and used in the treatment of various infections and diseases.

2. Any of a group of broad-spectrum antibiotic drugs, synthetic or semisynthetic, that are derived from penicillin.

3. An antibiotic drug obtained from molds especially of the genus Penicillium or produced synthetically, available in various preparations and usually used to treat infections caused by gram-positive bacteria.

4. (Chem.) Any of a variety of substances having a structure containing a beta-lactam ring fused to a thiirane ring, to which a carboxyl group is attached, but most commonly interpreted as benzyl penicillin. They are notable as powerful antibacterial agents of relatively low toxicity which have found extensive use in medicine for treating bacterial infections. They are categorized as one of the classes of beta-lactam antibiotic. They are produced naturally by some fungi and bacteria, and industrial production processes almost invariably start from some form of the penicillin nucleus produced by fermentation of microorganisms. The fermentation products are then chemically modified to produce derivatives of enhanced potency, safety, or antibacterial spectrum. The first penicillin to see extensive use clinically (during World War II) was penicillin G, also called benzypenicillin, and commonly simply “penicillin”.

5. any of various antibiotics obtained from Penicillium molds (or produced synthetically) and used in the treatment of various infections and diseases


1. No government forces a hospital to give penicillin to a patient who has pointed out that he is allergic to it.

2. Computers have not really changed the world, not the way railways did or penicillin.

3. ‘Major classes of antibiotics include tetracyclines, aminoglycosides, penicillins, cephalosporins, fluoroquinolones, streptogramins, sulfonamides, and erythromycins.’

4. ‘The antibiotics used were mainly cephalosporins, penicillins, fluoroquinolones, aminoglycosides, tetracyclines and antituberculosis drugs.’

5. ‘Most antibiotics such as penicillins, cyclosporines, and aminoglycosides can be used safely during pregnancy, but tetracyclines should be avoided.’

6. ‘Oral antibiotics are usually used in the treatment and include first-generation cephalosporins, penicillinase-resistant penicillins, macrolides, and fluoroquinolones.’

7. ‘It is well established that far less expensive antibiotics, including the penicillins and tetracyclines, are highly effective against Anthrax.’

8. ‘All the usual range of antibiotics, penicillins and cephalosporins are pretty much useless against these things.’

9. ‘Antibiotic categories to consider include penicillins, cephalosporins, and macrolides.’

10. ‘Many were originally sensitive to antibiotics such as penicillins, but overuse of these drugs has resulted in many multi-resistant bacteria.’

11. ‘The lactams are a family of antimicrobial agents consisting of four major groups: penicillins, cephalosporins, monobactams, and carbapenems.’

12. ‘While the incidence of true cross-reactivity between penicillins and cephalosporins is low, the possible reactions include anaphylaxis, which can be fatal.’

13. ‘Enterococci are inherently resistant to cephalosporins, semi-synthetic penicillins, and clindamycin.’

14. ‘Exanthematous eruptions most commonly occur in association with the administration of penicillins or cephalosporins.’

15. ‘In general, cephalosporins and penicillins are not very effective in treating acne.’

16. ‘For the patient who is allergic to penicillins, the use of trimethoprim/sulfamethoxazole is indicated.’

17. ‘The aminopenicillins were the first penicillins discovered to be active against gram-negative rods such as E. coli and H. influenzae.’

18. ‘The surprising finding was that people who had reacted to sulphonamides were more likely to react to penicillins than to sulphonamide non-antibiotics.’

19. ‘Within these two therapeutic drug classes, penicillins were identified 22 times, cephalosporins 21 times, and opioids 20 times.’

20. ‘Overuse of antibiotics has been shown to drive the evolution of mutant strains of bacteria immune to a broad spectrum of drugs, including penicillins, cephalosporins, and quinolones.’

21. ‘Studies from the late 1960s and the 1970s revealed that streptococcal eradication was equal with intramuscularly and orally administered penicillins.’

22. ‘Unlike Streptococcus pneumoniae, group A beta-hemolytic streptococci have not developed resistance to penicillins.’

23. penicillin was an important discovery

Other users have misspelling penicillin as:

1. penicillium 8.14%

2. punicalin 5.25%

3. pencillium 4.46%

4. pencilin 2.62%

5. Other 79.53%

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