micrometeoroid

noun

Etymology: Etymology tree Proto-Indo-European *mey-der.? Ancient Greek μικρός (mikrós)der. English micro- English meteor Ancient Greek -ο- (-o-)der. Latin -o- Proto-Indo-European *weyd- Proto-Indo-European *-os Proto-Indo-European *wéydos Proto-Hellenic *wéidos Ancient Greek εἶδος (eîdos) Proto-Indo-European *-os Proto-Indo-European *-ēs Ancient Greek -ης (-ēs) Ancient Greek -ειδής (-eidḗs) Latin -oīdēslbor. English -oid English meteoroid English micrometeoroid From micro- + meteoroid.

1. an extraterrestrial particle less than a millimeter in size