What is the meaning of Epiphyte?

A plant that grows on another, using it for physical support but obtaining no nutrients from it and neither causing damage nor offering benefit; an air plant.

A fungus that grows on a plant but does not feed upon it saprotrophically (an epiphytic fungus). (The science of detecting and studying any such symbiosis as may be involved in this relationship is still developing.)

Source: wiktionary.org