echo-, ech-

(Greek: sound, noise; especially a returned sound; repetition, imitation)




anecho
anechoic (adjective), more anechoic, most anechoic
Relating to being without echoes: The scientist was experimenting with the absorption of sound waves and radar signals in a special anechoic chamber.
catecheses (plural)
catechesis (singular)
catechetical
catechism
catechist
catechization
catechize
catechizing
catechumen
echo
echoacousia (s) (noun), echoacousias (pl)
A hearing defect in which sounds bounce and are repeated instead of being perceived as normally heard sounds: "Manfred found that the echoacousia which he was experiencing was very distracting; especially, when he is trying to listen to music, his TV, or what people are saying to him."
echocardiogram
1. A medical test which uses high-frequency sound waves to image the heart and surrounding tissues.
2. An image of the heart produced by ultrasonography or a test that uses sound waves to create a moving picture of the heart.

The picture is much more detailed than x-ray images and involves no radiation exposure.

echocardiograph
An ultrasound device used to examine the working heart and display moving images of its action.