| ELEUTHERODACTYL | • ELEUTHERODACTYL n. of birds, having the hind toe free. | 
| HETERODACTYLOUS | • heterodactylous adj. (Zoology) Having the first and second toes turned backward, as in the trogons. • HETERODACTYLOUS adj. having the first and second toes turned backwards, as in trogons, and not the first and fourth as in parrots.
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| HEXADACTYLOUS | • hexadactylous adj. (Zoology) Having six fingers or toes. • HEXADACTYLOUS adj. having six fingers, also HEXADACTYLIC.
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| HYDROMETALLURGY | • hydrometallurgy n. The field of extractive metallurgy involving the use of aqueous chemistry for the recovery of metals… • HYDROMETALLURGY n. the treatment of ores by wet processes (as leaching).
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| HYDROPNEUMATIC | • hydropneumatic adj. Operated by both fluid and air power. • hydropneumatic adj. Being, or pertaining to, a type of automotive suspension system based on a nitrogen springing medium.
 • HYDROPNEUMATIC adj. utilizing water and air acting together.
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| HYDROSULPHATE | • hydrosulphate n. Alternative form of hydrosulfate. • HYDROSULPHATE n. any quaternary acid salt formed by addition of an organic base to sulphuric acid, such as aniline hydrosulphate.
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| HYDROSULPHATES | • hydrosulphates n. Plural of hydrosulphate. • HYDROSULPHATE n. any quaternary acid salt formed by addition of an organic base to sulphuric acid, such as aniline hydrosulphate.
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| HYDROXYBUTYRATE | • hydroxybutyrate n. (Chemistry) any salt or ester of hydroxybutyric acid, but especially of gamma-hydroxybutyric acid. • HYDROXYBUTYRATE n. as in gamma hydroxybutyrate, a substance that occurs naturally in the brain, used medically as a sedative but also as a recreational drug and alleged aphrodisiac.
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| HYPERFASTIDIOUS | • hyperfastidious adj. Extremely fastidious. • HYPERFASTIDIOUS adj. excessively fastidious.
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| LECYTHIDACEOUS | • lecythidaceous adj. (Botany) Of or relating to the family Lecythidaceae, that includes the Brazil nuts. • LECYTHIDACEOUS adj. belonging to the Lecythidaceae, a family of tropical trees including the Brazil nut.
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| MEALYMOUTHED | • mealymouthed adj. Alternative form of mealy-mouthed. • mealy-mouthed adj. Prone to speaking evasively, indirectly, or duplicitously; not forthright.
 • MEALYMOUTHED adj. not plain and straightforward.
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| PACHYDERMATOUS | • pachydermatous adj. Of or relating to the pachyderms. • pachydermatous adj. Like an elephant.
 • pachydermatous adj. (Humorous) Thick-skinned; insensitive.
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| RHEUMATOIDALLY | • RHEUMATOID adv. characteristic of or affected with rheumatoid arthritis. | 
| SOUTHWESTWARDLY | • southwestwardly adv. Toward the southwest. • SOUTHWESTWARDLY adv. in a southwesterly direction.
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| STOUTHEARTEDLY | • stoutheartedly adv. Bravely, courageously. • stoutheartedly adv. Resolutely.
 • stout-heartedly adv. Alternative form of stoutheartedly.
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| TETRAHYDROFURAN | • tetrahydrofuran n. (Organic chemistry) A heterocyclic ether having a five-membered ring with four carbon atoms and one… • TETRAHYDROFURAN n. a flammable liquid ether derived from furan and used as a solvent and as an intermediate in organic synthesis.
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| YOUTHHEAD | • youthhead n. (Obsolete) Youth; youthhood. • YOUTHHEAD n. (obsolete) youth, also YOUNGTH, YOUTHHOOD.
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| YOUTHHEADS | • YOUTHHEAD n. (obsolete) youth, also YOUNGTH, YOUTHHOOD. |