Having the characteristics or structure of an ascidia; shaped like or resembling a sac or ascidian.
From Latin 'ascidium' plus the suffix '-ate' (having the quality of), meaning 'having ascidian-like qualities.'
Biologists use 'ascidiate' to describe not just sea squirts themselves, but also fossils and structures that look sac-shaped—helping them spot evolutionary cousins from millions of years ago!
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