noun🔗ShareAny of many symbiotic organisms, being associations of algae and fungi, often found as white or yellow patches on old walls, etc."The old stone wall had many lichens growing on it, small white and yellow patches. "organismplantbiologyenvironmentnatureecologyChat with AIVocabulary GamePractice Reading
noun🔗ShareSomething which gradually spreads across something else, causing damage."The dampness in the basement fostered a lichen that slowly spread across the walls, damaging the paint job. "environmentbiologyChat with AIVocabulary GamePractice Reading
