hummock (n.) Look up hummock at
"knoll, hillock," 1550s, originally nautical, "conical small hill on a seacoast," of obscure origin, though second element probably is the diminutive suffix -ock. In Florida, where the local form is hammock, it means a clump of hardwood trees on a knoll in a swamp or on a key. Related: Hummocky.