from the GNU version of the Collaborative International Dictionary of English
- n. any heartshaped, spatangoid sea urchin. See Spatangoid.
from The Century Dictionary and Cyclopedia
- n. A heart-shaped sea-urchin; any spatangoid. Also called mermaid's-head.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. sea urchin having a heart-shaped body in a rigid spiny shell
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