A measure of viscosity used in conjunction with a Redwood viscometer and equal to one second of the time required for a given quantity of fluid to pass through a capillary in the instrument.
Origin
1920s.
Definition of Redwood second in US English:
Redwood second
noun
A measure of viscosity used in conjunction with a Redwood viscometer and equal to one second of the time required for a given quantity of fluid to pass through a capillary in the instrument.