echo-, ech-

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

anecho

anechoic

Free from echoes; completely absorbing sound waves or radar signals.

catecheses (plural)

catechesis (singular)

catechetical

catechism

catechist

catechization

catechize

catechizing

catechumen

echo

echoacousia, echoacusis

The subjective experience of hearing echoes after normally heard sounds.

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.

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echo-, ech-

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

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