Sentence:  Another peculiar feature of these samples is that they exhibit a diapasonlike vibration if their container is hit with some metallic tool or simply with the finger nails. Because of the latter effect, these samples are called, in the laboratory idiom, "soundy". The samples become <WSD>soundy</WSD>, on the average, 24 hours after being prepared. 
Meaning of the word marked with <WSD> tags:  Characterized by or characteristic of sound.