Either: resembling an echo, or using words that imitate the sound they denote.
According to dictionary.com and audioenglish.net.
(Just saying)
Absolutely not.It is an American slang word with echoic origin.
The term I think you are looking for is "well circumscribed hypo-echoic nodule." The phrase well circumscribed means that the item looked at has well defined edges. When talking about nodules or tumors in the body, it is generally a good thing. The phrase hypo-echoic means that it did not reflect a lot of waves back to the sensor.
Some examples of echoic words include "buzz," "meow," "sizzle," "pop," and "boom." These words imitate sounds that they describe, making them onomatopoeic in nature.
They are sestinas.
a momentary sensory memory of auditory stimuli
heteroechoic nodule in left lobe
Some choices: echoed, voiced, choice, device, advice, acidic, accede, heaved, echoic, cached, coccid, codeia
duration of iconic memory for about less than one second whereas duration of Echoic memory for about Three to four second- Nilesh Gunjal ( M.A. Psychology)
echoic memory.
Since I have to assume you are seeing an ultrasound...the answer is no...it is not a nonviable pregnancy...in early pregnancy the conceptus in a horse is a circular ball that looks black in the center because it is fluid filled...as the conceptus changes into an embryo and subsequently a fetus it be comes white because the tissue is hyper-echoic (white) as opposed to hypo-echoic (black) fluid.
chicer, choice, choric, cicero, coheir, cowier, cowrie, echoic, heroic, ochery
The emptiness of the hall merely served to enhance the singer's echoic song. The loss left me filled with emptiness.