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Origin and history of bifocal

bifocal(adj.)

"having two foci," 1844; see bi- "two" + focal.

also from 1844

Entries linking to bifocal

focal(adj.)

"of or pertaining to a focus," 1690s, from Modern Latin focalis; see focus (n.) + -al (1).

bifocals(n.)

"bifocal spectacles," 1883, bi-focals; see bifocal. Invented by Benjamin Franklin, but he called them double spectacles.

bi-

word-forming element meaning "two, having two, twice, double, doubly, twofold, once every two," etc., from Latin bi- "twice, double," from Old Latin dvi- (cognate with Sanskrit dvi-, Greek di-, dis-, Old English twi-, German zwei- "twice, double"), from PIE root *dwo- "two."

Nativized from 16c. Occasionally bin- before vowels; this form originated in French, not Latin, and might be partly based on or influenced by Latin bini "twofold" (see binary). In chemical terms, it denotes two parts or equivalents of the substance referred to. Cognate with twi- and di- (1).

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    rock
    [stone, mass of mineral matter], Middle English rokke, roche "stone as a substance; large rocky formation, rocky height or outcrop, crag," from Old English rocc (as in stanrocc "stone rock or obelisk") and directly from Old North French roque, variant of Old French roche, which i
    individual
    early 15c., "one and indivisible, inseparable" (with reference to the Trinity), from Medieval Latin individualis, from Latin individuus "indivisible," from in- "not, opposite of" (see in- (1)) + dividuus "divisible," from dividere "divide" (see divide (v.)). Original sense now ob
    account
    c. 1300, "counting," especially "reckoning of money received and paid, detailed statement of funds owed or spent or property held," from Old French acont "(financial) account, reckoning, terminal payment," from a "to" (see ad-) + cont "counting, reckoning of money to be paid," fr
    loyalty
    c. 1400, from Old French loialte, leaute "loyalty, fidelity; legitimacy; honesty; good quality" (Modern French loyauté), from loial (see loyal). The Medieval Latin word was legalitas. The earlier Middle English form was leaute (mid-13c.), from the older French form. Loyalty oath
    ordeal
    Old English ordel, ordal, "trial by physical test," literally "judgment, verdict," from Proto-Germanic noun *uz-dailjam "a portioning out, judgment" (source also of Old Saxon urdeli, Old Frisian urdel, Dutch oordeel, German urteil "judgment"), literally "that which is dealt out"
    honeymoon
    "indefinite period of tenderness and pleasure experienced by a newly wed couple," 1540s (hony moone), but probably older, from honey (n.) in reference to the new marriage's sweetness, and moon (n.) "month" in reference to how long it probably will last, or from the changing aspec
    robot
    1923, "mechanical person," also "person whose work or activities are entirely mechanical," from the English translation of the 1920 play "R.U.R." ("Rossum's Universal Robots") by Karel Capek (1890-1938), from Czech robotnik "forced worker," from robota "forced labor, compulsory s
    brood
    Old English brod "offspring of egg-laying animals, hatchlings, young birds hatched in one nest," from Proto-Germanic *brod (source also of Middle Dutch broet, Old High German bruot, German Brut "brood"), etymologically "that which is hatched by heat," from *bro- "to warm, heat,"
    boondoggle
    "wasteful expenditure," especially by the government under guise of public good, April 1935, American English; earlier it was a name for a kind of braided leather lanyard made by Boy Scouts and worn by them around the neck or hat. In this sense it is attested from 1930, and accor
    humor
    mid-14c., "fluid or juice of an animal or plant," from Old North French humour "liquid, dampness; (medical) humor" (Old French humor, umor; Modern French humeur), from Latin umor "body fluid" (also humor, by false association with humus "earth"); related to umere "be wet, moist,"

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