Noun
a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere
Source: WordNetThis time he was able to grab hold of some wire bundles and retrieved the Micrometeorite Collector (S-10) from the Agena. Source: Internet
Collins' first task was to retrieve a Micrometeorite Collector (S-12) from the side of the spacecraft. Source: Internet