Hypertension, or high blood pressure, is a condition in which blood-pressure at rest is higher than the body's needs. Because hypertension lacks overt symptoms, high blood pressure can go unnoticed for years.
2. metric-a decimal unit of measurement of the metric system (based on meters and kilograms and seconds); convert all the measurements to metric units; it is easier to work in metric. metric unit.
Deca-Deca-(?). pref. [Cf. Ten.] A prefix, from Gr. de`ka, signifying ten; specifically (Metric System), a prefix signifying the weight or measure that is ten times the principal unit.