Jisho

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Wikipedia definition
1. Najas marinaNajas marina is a species of aquatic plant known by the common names spiny naiad and holly-leaved water nymph. It can be found nearly worldwide in many types of freshwater and brackish aquatic habitat, including bodies of alkaline water. This annual plant produces a slender, branching stem up to 40 or 45 centimeters in maximum length. The evenly spaced leaves are up to 4 centimeters long, 1 to 3 millimeters wide, and edged in tiny sawlike teeth. The leaf has prickles along its midvein.
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