IPA: /ˌɛndəˈlɪθɪk/
KK: /ɛnˈdɒlɪθɪk/
Describing organisms that live inside or deeply within rocks or coral.
Some species of algae are endolithic, thriving in the protective environment of coral reefs.
Endolithic → It is formed from "endo-" (meaning within) and "lithos" (meaning stone). The word describes organisms that live within the rock or stone.
Think of something that lives 'within' ('endo-') a 'stone' ('lithos') — that's why endolithic refers to life inside rocks.