| helm | (noun) (figurative) a position of leadership | - |
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| (noun) steering mechanism for a vessel; a mechanical device by which a vessel is steered | - |
| (verb) be at or take the helm of | - |
| helmet | (noun) a protective headgear made of hard material to resist blows | - |
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| (noun) armor plate that protects the head | - |
| helmeted | (adjective) equipped with or wearing a helmet | - |
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| helmetflower | (noun) a herbaceous plant of the genus Scutellaria which has a calyx that, when inverted, resembles a helmet with its visor raised | Synonyms: skullcap |
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| (noun) a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite | Synonyms: Aconitum napellus, helmet flower, monkshood |
| (noun) any of several orchids of the genus Coryanthes having racemes of a few musky-scented waxy flowers with a helmet-shaped lip process | Synonyms: helmet orchid |
| helminth | (noun) worm that is parasitic on the intestines of vertebrates especially roundworms and tapeworms and flukes | Synonyms: parasitic worm |
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| helminthiasis | (noun) infestation of the body with parasitic worms | - |
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| helminthic | (adjective) capable of expelling or destroying parasitic worms | Synonyms: anthelminthic, anthelmintic, parasiticidal |
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| (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelminthic, anthelmintic, vermifuge |
| helmsman | (noun) the person who steers a ship | Synonyms: steerer, steersman |
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