Hidrodinâmico

= hydrodynamic.
Ex: The author discusses the hydrodynamic reasons why a riverbed meanders through a plain.

Hydrodynamic

Azipod, Ship propulsion system in which an electric motor placed in a hydrodynamic capsule, the pod, is used to turn the propeller thus eliminating long shafts, gear boxes and all kinds of reduction gear which use too much space and determine the loss of propeller horsepower. The possibility of gyrating 360° does away with rudders. It is also designed to make a cruise ship easier to steer and manoeuvre while achieving fuel savings of about 15% through improved hydrodynamic efficiency. Click on the numbers bellow to see it.
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Hydrodynamics

Hydrodynamically optimized pod