Quantitative PCR
 
- A PCR method that enables the number of DNA molecules in a sample to be estimated.
Definition from:
BioInformatics Glossary

[See Real Time PCR]

Quencher

- A molecular entity that deactivates (quenches) an excited state of another molecular entity, either by energy transfer, electron transfer, or by a chemical mechanism
Definition from:
Assays, labels, signaling & detection glossary

- The molecule that absorbs the emission of fluorescent reporter when in close vicinity.
Definition from:
http://www.dorak.info/genetics/glosrt.html

Quenching

- The reduction of luminescence of a sample by the addition of a quencher.
Definition from:
http://www.dddmag.com/glossary.aspx?lm=7#q