English
endolith
From endo- + -lith.
Proto-Germanic *liþuz ‘limb’
Proto-West Germanic *liþu
Old English liþ ‘limb, member, joint, tip of finger, point’
Middle English lith
English lith
Today it means
noun An organism (generally a small or micro-organism) living inside rocks.
Language periods are conventional ranges, not dates for this word.
Etymograph / endolith