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An aquatic plant (Hydrilla verticillata) native to Eurasia, Africa, and Australia, having whorled, lance-shaped leaves and small white flowers. It is considered a weed in North America, where it forms large dense mats in waterways.

[New Latin, genus name, diminutive of Latin hydra, hydra; see hydra.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Plants) any aquatic plant of the Eurasian genus Hydrilla, growing underwater and forming large masses: used as an oxygenator in aquaria and pools. It was introduced in the S US where it has become a serious problem, choking fish and hindering navigation
[C20: New Latin, probably from hydra]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hydrilla - submersed plant with whorled lanceolate leaves and solitary axillary flowers; Old World plant naturalized in southern United States and clogging Florida's waterways
genus Hydrilla - one species
aquatic plant, hydrophyte, hydrophytic plant, water plant - a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Lake Trafford, a lake left for dead due to a nutrient-fed hydrilla explosion only a few years ago, has rebounded thanks to native bulrush plantings.
It's shallow--sometimes less than two feet deep around hydrilla or milfoil--with a sandy bottom.
Hydrilla can serve as food for waterfowl but it's not a preferred source and may out-compete beneficial species.
Both plant species are often misidentified and sold by pet stores and online companies, often under the name "anacharis." Hydrilla verticillata was also dumped from an aquarium into Tinker Park Nature Center pond in Henrietta (Monroe County), and DEC is currently working to control this population and protect the waterbodies connected to the pond.
ProcellaCOR is a new, advanced tool for selective, systemic control of major invasive aquatic weeds including hydrilla, Eurasian and hybrid watermilfoils, crested floating heart, water hyacinth, and many more.
Hydrilla, Hydrilla verticillata (L.f.) Royle (Hydrocharitaceae), also commonly known as water thyme or Florida elodea, is an extremely successful macrophyte that has invaded several continents worldwide and is considered a nuisance species (Evans & Wilkie 2010).
It planted the Hydrilla verticillata, tape grass, and so forth.
Moreover, a large number of submerged plants could also be found in this plant belt, such as Vallisneria natans (Lour.) Hara and Hydrilla verticillata (L.f.) Royle.
Caption: Australian researcher Matt Purcell collecting hydrilla in China.
Aetokthonos hydrillicola has been identified in all reservoirs where AVM deaths have occurred and was identified growing abundantly on an exotic SAV hydrilla (Hydrilla verticillata) in Lake Tohopekaliga (Toho) in central Florida.
Growth of Hydrilla verticillata (L.f.) Royle under controlled conditions.