The gyroviscous stress is computed for a weakly magnetized plasma, i.e., one in which the thermal ion gyroradius may exceed the equilibrium gradient scale length. A simple and useful formula is derived and shown to reduce to the previous strongly magnetized result. Applicability is illustrated with a typical field-reversed configuration equilibrium solution. This form is the most useful to date for the study of kinetic ion phenomena in weakly magnetized plasmas within a fluid model.

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