Etymology
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sonogram (n.)

1956, from combining form of Latin sonus "sound" (from PIE root *swen- "to sound") + -gram. Related: Sonograph (1951).

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Definitions of sonogram

sonogram (n.)
an image of a structure that is produced by ultrasonography (reflections of high-frequency sound waves); used to observe fetal growth or to study bodily organs;
Synonyms: echogram
From wordnet.princeton.edu