Home › Words › M › microballoonmicroballoonmicroballoon means A hollow microsphere.EtymologyFrom micro- + balloon.nounA hollow microsphereDefinitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.microspherical 65% match — Composed of microscopic spheres vs microballoon →microbubble 65% match — A microscale bubble, used in medical diagnostics as a contrast agent for ultrasound imaging. vs microballoon →perflutren 61% match — A preparation of microspheres used as an ultrasound contrast agent vs microballoon →fluosphere 61% match — A fluorescent microsphere vs microballoon →polyball 60% match — A polystyrene sphere, used in fishing, in science experiments, etc. vs microballoon →microspherule 60% match — A microscopic spherulite vs microballoon →nanospherule 59% match — A nanoscale spherule vs microballoon →sphericle 58% match — A small sphere. vs microballoon →