这个词是什么意思？
A plant genus of the family Plantaginaceae. The small plants usually have a dense tuft of basal leaves and long, leafless stalks bearing a terminal spike of small flowers. The seeds, known as PSYLLIUM, swell in water and are used as laxatives. The leaves have been used medicinally.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D010943 · MeSH 2026。
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