IPA: /ˌmaɪ.kroʊˌmiː.təˈrɪ.tɪk/
KK: /maɪkroʊˌmiːtəˈrɪtɪk/
Relating to very small particles from space that enter the Earth's atmosphere.
Scientists study micrometeoritic materials to understand the origins of our solar system.
Micrometeoritic → It is formed from "micro-" (from Greek "mikros", meaning small) and "meteoritic" (from Greek "meteōros", meaning high in the air or celestial). The word describes something related to small particles from space, specifically meteoroids.
Think of 'small' ('micro-') particles that come from 'high in the air' ('meteoritic') — that's what micrometeoritic refers to.