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.

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a granular metamorphic rock.
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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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020