英语词源字典 - 在线词源网站

hydrodynamics [hydrodynamics 词源字典]: "The branch of science concerned with forces acting on or exerted by fluids (especially liquids)", Late 18th century: from modern Latin hydrodynamica, from Greek hudro- 'water' + dunamikos (see dynamic).[hydrodynamics etymology, hydrodynamics origin, 英语词源]
hyperon: "An unstable subatomic particle classified as a baryon, heavier than the neutron and proton", 1950s: from hyper- 'beyond, over' + -on.
hexad: "A group or set of six", Mid 17th century (denoting a series of six numbers): from Greek hexas, hexad-, from hex 'six'.
homaloidal: "Of or relating to straight lines and planes; satisfying the axioms of Euclidean geometry, flat", Mid 19th cent.; earliest use found in James Joseph Sylvester (1814–1897), mathematician. From ancient Greek ὁμαλός + -oidal.
hormesis: "The phenomenon or condition of a substance or other agent having a beneficial physiological effect at low levels of exposure even though toxic or otherwise harmful at higher levels", 1940s. From Hellenistic Greek ὅρμησις rapid motion, eagerness from ancient Greek ὁρμάειν to set in motion, impel, urge on (from ὁρμή rapid motion forward, onrush, impulse from the base of ὄρνυσθαι to urge on, make rise, of uncertain origin (but apparently Indo-European) + -σμα, extended form of -μα: see -oma) + -σις.
Hypnos: "The god of sleep, son of Nyx (Night)", From Greek hupnos 'sleep'.
hoarding: "A large board in a public place, used to display advertisements", Early 19th century: from obsolete hoard in the same sense (probably based on Old French hourd; related to hurdle) + -ing¹.
Homo erectus: "An extinct hominid that is believed to have spread from Africa to Europe and Asia about 2 million years ago and appears to have survived in Asia to at least 150,000 years ago. Compare Java, Peking man, Solo. Also in extended use: man as a biped", Early 20th cent.; earliest use found in Popular Science Monthly. From scientific Latin Homo erectus, species name from Homo, genus name + erectus, specific name, specific use of classical Latin ērectus, so called on account of its upright (fully bipedal) posture. Compare earlier Pithecanthropus.
horrent: "(Of a person’s hair) standing on end", Mid 17th century: from Latin horrent- '(of hair) standing on end', from the verb horrere.
hypolimnion: "The lower layer of water in a stratified lake, typically cooler than the water above and relatively stagnant", Early 20th century: from hypo- 'below' + Greek limnion (diminutive of limnē 'lake').
helicoid: "A helical or spiral object", Late 17th century: from Greek helikoeidēs 'of spiral form', from helix, helik- (see helix).
honnête homme: "A decent, cultivated man of the world; a gentleman", French, literally 'honest man'.
hymenium: "(In higher fungi) a surface consisting mainly of spore-bearing structures (asci or basidia)", Early 19th century: from Greek humenion, diminutive of humēn 'membrane'.
houselet: "A small house", Early 19th cent.; earliest use found in William Taylor (1765–1836), reviewer and translator. From house + -let.
heronshaw: "Originally: a young or small heron. Later more generally: any heron", Late Middle English. From Anglo-Norman herouncel, herencell, heronsew young heron (1334, in plural form heronceux, or earlier; compare Middle French (Champagne) heronçaul, heronceau) from heron, heroun + -cel, diminutive suffix.
hough: "variant spelling of hock¹ (sense 1)", Old English hōh 'heel', of Germanic origin; related to heel¹.
heigh: "Expressing encouragement or enquiry", Natural utterance: first recorded in Middle English.
Himalayas: "A vast mountain system in southern Asia, extending 2,400 km (1,500 miles) from Kashmir eastwards to Assam", From Sanskrit Himālaya, from hima 'snow' + ālaya 'abode'.
Himalayas: "A vast mountain system in southern Asia, extending 2,400 km (1,500 miles) from Kashmir eastwards to Assam", From Sanskrit Himālaya, from hima 'snow' + ālaya 'abode'.
habitus: "General constitution, especially physical build", Late 19th century: from Latin.