doubling time, \(t_{\text{D}}\)

in biotechnology
https://doi.org/10.1351/goldbook.D01855
The time (\(\min \), \(\mathrm{h}\)) required for a cell population to double either the number of cells or the active cell mass.
Source:
PAC, 1992, 64, 143. 'Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)' on page 152 (https://doi.org/10.1351/pac199264010143)