Ancient Greek λειχήν

← Ancient Greek λείχω (mention)

← Proto-Indo-European *leyǵʰ- (inherited)

→ English lichen (derived)

→ Spanish liquen (derived)

→ French lichen (derived)

→ Irish léicean (derived)

→ Galician lique (derived(gl/es))

→ Ancient Greek ἱππολειχήν (compound)

→ Latin lichen (borrowed)