| Hydra | press in which a force applied by a piston to a small area is transmitted through water to another piston having a large area |
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| Hydra | a water pump that uses the kinetic energy of flowing water to force a small fraction of that water to a reservoir at a higher level |
| Hydra | a water pump that uses the kinetic energy of flowing water to force a small fraction of that water to a reservoir at a higher level |
| Hydra | a mechanism operated by the resistance offered or the pressure transmitted when a liquid is forced through a small opening or tube |
| Hydra | a transmission that depends on a hydraulic system |
| Hydra | a transmission that depends on a hydraulic system |
| Hydra | in a hydraulic manner |
| Hydra | in a hydraulic manner |
| Hydra | study of the mechanics of fluids |
| Hydra | a colorless fuming corrosive liquid |
| Hydra | the bivalent group -HNNH- derived from hydrazine |
| Hydra | the bivalent group -HNNH- derived from hydrazine |