Noun

1. Two closely related genera of New World palms, of the family Arecaceae; (a) Serenoa repens or the saw palmetto is the only species of its genus; it has certain medicinal uses; (b) Sabul, represented by about 15 species, some known commonly as palmettos, others as fan palms.
2. A native or resident of the American state of South Carolina (female: Palmetta).

Adjective

1. Of or pertaining to a palmetto palm.
2. Of or pertaining the the US state of South Carolina, as the Palmetto State.