any of various chiefly aquatic, flowerless vascular plants constituting the cosmopolitan genus Isoetes, so called from their long cylindrical leaves…
Any of the quillworts (genus Isoetes), plants allied to ferns which characteristically grow on lake bottoms; esp. the European species I. lacustris…
An aquatic plant of the genus so called; = quillwort n. at quill, n.1 compounds 2.
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