Moss -
Any of various small green plants growing on the ground or on the surfaces of trees, stones etc. ; now specifically, a plant of the divisionBryophyta formerly Musci.
Moss -
A type or species of such plant.
Verb
Moss -
To become covered with moss.
Moss -
To cover something with moss.
Wikipedia
Mosses are small, soft plants that are typically 1–10 cm (0.4–4 in) tall, though some species are much larger. They commonly grow close together in clumps or mats in damp or shady locations. They do not have flowers or seeds, and their simple leaves cover the thin wiry stems.
OmegaWiki Dictionary
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Moss Any plant of the class Bryophyta, occurring in nearly all damp habitats.