tacho-, tach-, tachy-

(Greek: fast, speed, swift, rapid)

acestachy
A fast rate of healing.
acrotach
Something that is fast or speedy in a high place; such as, an aircraft, rocket, etc.
auxetachy
Rate of growth.
bradypnea
1. An abnormal slowness of respiration or breathing; specifically a low respiratory frequency.
2. A respiratory, or breathing, rate that is too slow.

The normal rate of respirations (breaths per minute) depends on a number of factors, including the age of the individual and the degree of exertion.

cardiotachy
Speed of the heart beat.
hemotachometer
An instrument that measures the speed of blood flow.
hemotachometry
The measurement of the speed of blood flow.
hemotachy
Speed of the flow of blood.
hypacestachy
Diminished rate of healing.
hypauxetachy
Diminished rate of growth.
hyperacestachy
Excessive rate of healing.
hyperauxetachy
An excessive rate of growth.
hypertachopnea
An excessive increase in the rate of respiration.
phototachometer, phototachometric, phototachometrical
An apparatus for determining the velocity of light.
phototachometry
The measurement of the velocity of light.