Shaped like or resembling a hedgehog or sea urchin; having a round, spiky form.
From Greek 'echinos' (ἐχῖνος) meaning 'hedgehog' or 'sea urchin,' combined with Latin 'forma' meaning 'form' or 'shape.' The suffix '-form' indicates resemblance or similarity.
Echiniform shapes appear throughout nature—from coronavirus particles under electron microscopes to certain sea urchin species—showing how evolution repeatedly produces spiky ball shapes for protection and structure!
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