Any of various small, green, seedless plants growing on the ground or on the surfaces of trees, stones, etc.; now specifically, a plant of the phylum Bryophyta (formerly division Musci).

A kind or species of such plants.

Any alga, lichen, bryophyte, or other plant of seemingly simple structure.

“Irish moss”

To become covered with moss.

“An oak whose boughs were mossed with age.”

To cover (something) with moss.