| echo-, ech- (Greek: sound, noise; especially a returned sound; repetition, imitation).anecho: anechoic: catecheses (plural): catechesis (singular): catechetical: catechism: catechist: catechization: catechize: catechizing: catechumen: echo: echoacousia: echoacusis: echocardiogram: echocardiograph: echocardiography: echoed: echoencephalography: echoes: echoesis: echogenic: echogram: echograph: echographer: echographia: echography: echoic: echoism: echokinesia: echokinesis: echolalia: echolocation: echomimia: echomotism: echopathy: echophonia: echophony: echophotony: echophrasia: echopraxia: echoscope: |