43 concave mirror ray diagram class 7
Old English hol (adj.) "hollow, concave;" as a noun, "hollow place; cave; orifice; perforation," from Proto-Germanic *hulan (source also of Old Saxon, Old Frisian, Old High German hol, Middle Dutch hool, Old Norse holr, German hohl "hollow," Gothic us-hulon "to hollow out"), from PIE root *kel- (1) "to cover, conceal, save." As an adjective, it has been displaced by hollow, which in Old English was only a noun, meaning "excavated habitation of certain wild animals." As a contemptuous word for "small dingy lodging or abode" it is attested from 1610s. Meaning "a fix, scrape, mess" is from 1760. Obscene slang use for "vulva" is implied from mid-14c. Golfing hole-in-one is from 1914; as a verbal phrase from 1913. To need (something) like a hole in the head, applied to something useless or detrimental, first recorded 1944 in entertainment publications, probably a translation of a Yiddish expression such as ich darf es vi a loch in kop.
1590s, "engine of war consisting of a small, attachable bomb used to blow in doors and gates and breach walls," from French pƩtard (late 16c.), from French pƩter "break wind," from Old French pet "a fart," from Latin peditum, noun use of neuter past participle of pedere "to break wind," from PIE root *pezd- "to fart" (see feisty). Surviving in figurative phrase hoist with one's own petard (or some variant) "caught in one's own trap, involved in the danger one meant for others," literally "blown up with one's own bomb," which is ultimately from Shakespeare (1605): For tis the sport to haue the enginer Hoist with his owne petar ["Hamlet" III.iv.207]. For the verb, see hoist. The thing itself was rendered obsolete by the development of bombs; it seems to have had a reputation for backfiring. Related: Petardier.
*keuÉ-, Proto-Indo-European root meaning "to swell," also "vault, hole." It forms all or part of: accumulate; accumulation; cave; cavern; cavity; coeliac; church; codeine; coelacanth; coeliac; coelomate; concave; cumulate; cumulative; cumulus; enceinte; excavate; kirk; kymatology; Kyrie eleison. It is the hypothetical source of/evidence for its existence is provided by: Sanskrit svayati "swells up, is strong;" Greek kyein "to swell," koilos "hollow, hollowed out, spacious, deep;" Latin cumulus "a heap, pile, mass, surplus;" Lithuanian Å”aunas "firm, solid, fit, capable;" Middle Irish cua "hollow;" Armenian soyl "cavity."
Concave mirror ray diagram class 7
"the first five books of the Bible," those traditionally ascribed to Moses, c. 1400, Penta-teuke, from Late Latin pentateuchus (Tertullian, c. 207), from Greek pentateukhos (c. 160), originally an adjective (abstracted from phrase pentateukhos biblos), from pente "five" (from PIE root *penkwe- "five") + teukhos "implement, vessel, gear" (in Late Greek "book," via notion of "case for scrolls"), literally "anything produced," related to teukhein "to make ready," from PIE *dheugh- "to produce something of utility" (see doughty). Glossed in Old English as fifbec. Related: Pentateuchal.
"a crescent or crescent-shaped body," 1690s in reference to lenses convex on one side, concave on the other, and thicker in the middle; c. 1812 in reference to liquid surfaces, Modern Latin meniscus, from Greek meniskos "lunar crescent," diminutive of mene "moon" (see moon (n.)). Related: Meniscoid; mensicoidal; mensical; mensicate.
mid-14c., "chisel with a concave blade," from Old French gouge "a gouge" (14c.), from Late Latin gubia, alteration of gulbia "hollow beveled chisel," probably from Gaulish (compare Old Irish gulban "prick, prickle," Welsh gylfin "beak"). Meaning "an imposition, a cheat" is from 1845, American English colloquial.
Concave mirror ray diagram class 7.
"structure consisting of a large, flat, unhewn stone resting horizontally atop three or more upright ones," c. 1600, from Welsh, from crom, fem. of crwm "crooked, bent, concave" + llech "(flat) stone." Applied in Wales and Cornwall to what in Brittany is a dolmen; a cromlech there is part of a circle of standing stones.
usually castanets, "slightly concave shells of ivory or hard wood, fastened and used in beating time in music or dancing," 1640s, from French castagnette or directly from Spanish castaƱeta diminutive of castaƱa "chestnut," from Latin castanea (see chestnut).
c. 1400, "a concave surface," from Old French concavit "hollow, concavity" (14c.) or directly from Latin concavitatem (nominative concavitas), from Latin concavus "hollow, arched, vaulted, curved," from con-, here perhaps an intensive prefix (see con-), + cavus "hollow" (from PIE root *keue- "to swell," also "vault, hole"). From 1570s as "state of being concave."
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"incurved," early 15c., from Old French concave (14c.) or directly from Latin concavus "hollow, arched, vaulted, curved," from con-, here perhaps an intensive prefix (see con-), + cavus "hollow" (from PIE root *keue- "to swell," also "vault, hole").
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