| EC | (Greek mythology) a nymph who was spurned by Narcissus and pined away until only her voice remained |
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| EC | a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return (sonar is SOund NAvigation Ranging |
| EC | determining the location of something by measuring the time it takes for an echo to return from it |
| EC | diagnostic procedure that uses ultrasound to study to structure and motions of the heart |
| EC | (of words) formed in imitation of a natural sound |
| EC | like or characteristic of an echo |
| EC | (of sounds) repeating by reflection |
| EC | (psychiatry) mechanical and meaningless repetition of the words of another person (as in schizophrenia) |
| EC | having or producing no echo |
| EC | like or characteristic of an echo |
| EC | determining the location of something by measuring the time it takes for an echo to return from it |
| EC | any of a group of viruses associated with various diseases including viral meningitis and mild respiratory disorders and diarrhea in newborn infants |