0 to take an overdose (= a dangerously large amount) of a drug: --
1 an overdose (= a dangerously large amount) of a drug: --
He was prosecuted for his role in the musician's fatal OD.
That is the first symptom of an OD.
2 abbreviation for optical density : the degree to which an object or material reduces the intensity of light passing through it: --
Optical density (OD) measurement of bacterial cultures is a common technique used in microbiology.
After washing, the substrate buffer was applied and the optical density (OD) read at 405 nm when the positive reference samples had reached OD 1.0.
OD values were read after 30 minutes' incubation with substrate buffer.
Those hybridomas giving an optical density (OD) greater than 1.5 were single cell cloned.