dynoDefinition of dyno noun (plural dynos) 1short for dynamometer. 2 Climbing a rapid move across a rock face in order to reach a hold. verb (dynos, dynoing, dyno'd or dynoed) 1 [with object] measure (the output of an engine) with a dynamometer. 2 [no object] (in mountaineering) climb using dynos. dyno in other Oxford dictionaries Definition of dyno in the US English dictionary