PDA Technical Glossary

PDA Technical Reports are highly valued membership benefits because they offer expert guidance and opinions on important scientific and regulatory topics and are used as essential references by industry and regulatory authorities around the world. These reports include terms which explain the material and enhance the reader’s understanding.

The database presented here includes the glossary terms from all current technical reports. The database is searchable by keyword, topic, or by technical report. Each definition provided includes a link to the source technical report within the  PDA Technical Report Portal.

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Optical Density (OD)
A unitless measure of the absorption of light of a given wavelength in media of a given path length. (TR41)

Source: TR 41: Virus Filtration

Manufacturing Microbiology Validation Technology Transfer Visual Inspection