Wiktionary
microbubble
n. A microscale bubble, used in medical diagnostics as a contrast agent for ultrasound imaging.
Usage examples of "microbubble".
Since authenticated recordings of the God Emperor are lodged in the Bene Gesserit Archives, we have sent a sampling of our recordings, all of which were made on an ancient microbubble system, to the Sisterhood with a formal request that they conduct a comparison test.
The walls were made of membranes that drew oxygen from the surrounding seawater and ejected carbon dioxide, so that seen from a fish's point of view, the tunnels steamed like hot pasta on a cold steel plate as they excreted countless microbubbles of polluted CO2.