One of the mysteries of the English language finally explained.
Any of several aquatic plants with whorls of small leaves around the stem and inconspicuous flowers; especially. Canadian pondweed, Elodea canadensis, and the related waterweed Hydrilla verticillata.
Mid 17th century (in an earlier sense). From water + thyme.
water thyme/ˈwɔːtə ˌtʌɪm/
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