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anneal	to heat and then slowly cool (esp. glass or metal) so as to strengthen and make less brittle.
antimony	a chemical element that has fifty-one protons in each nucleus and forms a brittle bluish white metal crystal, used in hard alloys, electrical components, and medicines. (symbol: Sb)
arsenic	a poisonous chemical element that has thirty-three protons in each nucleus and occurs in brittle, grayish white crystalline masses or in yellow or black allotropes. (symbol: As) [1/2 definitions]
bismuth	a chemical element that has eighty-three protons in each nucleus and is a white brittle crystalline metal with very low thermal and electrical conductivity, used chiefly in alloys and medicines. (symbol: Bi)
cast iron	an alloy of iron, carbon, silicon, and other elements that ranges from hard and brittle to soft and strong depending on its composition.
celluloid	a flammable, brittle material used esp. for motion picture film. [1/2 definitions]
cobalt	a chemical element that has twenty-seven protons in each nucleus and occurs as a brittle silver-white solid metal, used in a variety of alloys to increase hardness. (symbol: Co)
crisp	firm but brittle, as a cracker. [1/7 definitions]
crispy	brittle and easily broken or crumbled; crisp. [1/2 definitions]
devitrify	to treat (glass or the like) so as to make opaque, brittle, and crystalline. [1/2 definitions]
dry rot	a fungus decay of seasoned timber that causes it to become brittle and crumble into a dry powder, or the fungus causing this decay. [1/3 definitions]
martensite	a hard brittle solid solution of iron and a small portion of carbon which is the main constituent of various carbon steels and is produced by chilling heated steel.
nougat	a chewy or brittle candy that contains nuts and sometimes chunks of fruit.
oatcake	a thin, flat, brittle cake made of oatmeal.
osmium	a chemical element that has seventy-six protons in each nucleus and that occurs as an octavalent ion or in pure form as an extremely hard, dense, brittle bluish metal solid used as a catalyst and esp. in alloys and in electron microscopy because of its extremely high density. (symbol: Os)
rose acacia	a shrub found in the southern United States that has brittle, prickling branches and bears clusters of large, rose-colored flowers.
rosin	a translucent, yellow-brown, brittle residue of the distillation of turpentine from pine sap, used as a friction-increasing agent, as on the bows of certain stringed instruments, and in manufacturing varnish, inks, and soap. [1/3 definitions]
tellurium	a chemical element that has fifty-two protons in each nucleus and that is usu. found in compounds, but that can be isolated as a toxic, brittle, silver-white crystal sometimes used in alloys with lead, copper, or iron to increase hardness and machinability. (symbol: Te)
white cedar	the American arbor vitae, which grows in cool areas of the northeastern United States and has soft, brittle, durable wood. [1/3 definitions]
zinc	a chemical element that has thirty protons in each nucleus and that occurs in pure form as a bluish white corrosion-resistant metal that is brittle at room temperature but becomes malleable when heated, used in a variety of alloys and in electrical devices. (symbol: Zn) [1/2 definitions]

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