i Register
In some senses, mossy is marked as UK, colloquial. Watch for register when choosing this word.
adj
Covered in or overgrown with moss.
The moſſy pales that ſkirt the orchard-green, / Here hid by ſhrub-vvood, there by glimpſes ſeen; […]
A Violet by a mossy stone / Half-hidden from the Eye! / —Fair, as a star when only one / Is shining in the sky!
noun
Alternative form of mossie (“mosquito”).