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Word of the day
forFebruary 9

coppern

(uncountable,chemistry) Areddish-brownmetallicchemical element (symbolCu) with theatomic number 29; also, themetalmade up of thiselement.
1. (uncountable) The reddish-browncolour of copper(etymology 1 sense 1).
  copper:
  2. (countable,entomology)In fullcopper butterfly: any of variouslycaenid butterflies with copper-coloured upperwings, especially those of thegeneraLycaena andParalucia.
2. (countable,dated) Any of variousspecializeditemsmade of copper(etymology 1 sense 1), where theuse of the metal is eithernecessary ortraditional to thefunction of the item.
  1. (countable) A coppermug used fordrinking alcoholic beverages.
  2. (countable) A coppersheet on which animage orwriting isengraved.
  3. (numismatics,countable) Acoin, typically of asmalldenomination, originally made of copper and now chiefly of other metals such asbronze; specifically, anEnglish orBritishpenny orhalfpenny; also, aUnited Statescent;(uncountable) coins made of coppercollectively.
    1. (countable,US,card games) In thegame offaro: originally a copper coin, now usually a smalldisc ortoken,placed on aplaying card toindicate that aplayer bets against thatcard.
  4. (Australia,UK,countable,dated) Alarge pot, originally made of copper but later often ofiron,filled withwater andheated over afire forcooking,washing clothes, etc. [...]

TheRussian chemist Dmitri Mendeleev, who formulated theperiodic law and created a version of theperiodic table ofelements, was born on 8 February in 1834 according to theGregorian calendar (27 January by theJulian calendar).

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