hardhead sponge
noun
any of several commercial sponges, as Spongia officinalis dura, of the West Indies and Central America, having a harsh, fibrous, resilient skeleton.
Origin of hardhead sponge
First recorded in 1880–85
Words nearby hardhead sponge
hardening,
hardening of arteries,
hardening of the arteries,
hardhack,
hardhead,
hardhead sponge,
hardheaded,
hardheads,
hardhearted,
hardicanute,
hardie