a strong tissue paper that burns evenly and is sufficiently porous to control the burning of the tobacco in a cigarette
reinforced concrete
Noun
concrete with metal and/or mesh added to provide extra support against stresses
ribonucleic acid
Noun
(biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes
refuse
Noun
food that is discarded (as from a kitchen)
refuse
Verb
show unwillingness towards
refuse
Verb
refuse to let have
refuse
Verb
refuse to accept
refuse
Verb
refuse entrance or membership
refuse
Verb
elude, especially in a baffling way
refuse
Verb
resist immunologically the introduction of some foreign tissue or organ
rheum
Noun
a watery discharge from the mucous membranes (especially from the eyes or nose)
recombinant deoxyribonucleic acid
Noun
genetically engineered DNA made by recombining fragments of DNA from different organisms
recombinant DNA
Noun
genetically engineered DNA made by recombining fragments of DNA from different organisms
ribonuclease
Noun
a transferase that catalyzes the hydrolysis of ribonucleic acid
ribonucleinase
Noun
a transferase that catalyzes the hydrolysis of ribonucleic acid
rubble
Noun
the remains of something that has been destroyed or broken up
radioactive dust
Noun
the radioactive particles that settle to the ground after a nuclear explosion
rose oil
Noun
a volatile fragrant oil obtained from fresh roses by steam distillation
resin
Noun
any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules
rosin
Noun
any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules
rosin
Verb
rub rosin onto
rhyolite
Noun
very acid volcanic rock
rottenstone
Noun
a weathered and decomposed siliceous limestone
red silk cotton
Noun
a plant fiber from the red silk-cotton tree of eastern India
rock oil
Noun
a dark oil consisting mainly of hydrocarbons
rice paper
Noun
a thin delicate material resembling paper
roofing paper
Noun
a heavy paper impregnated with tar and used as part of a roof for waterproofing
resorcinol
Noun
a crystalline phenol obtained from various resins
restriction endonuclease
Noun
any of the enzymes that cut nucleic acid at specific restriction sites and produce restriction fragments
restriction nuclease
Noun
any of the enzymes that cut nucleic acid at specific restriction sites and produce restriction fragments
restriction enzyme
Noun
any of the enzymes that cut nucleic acid at specific restriction sites and produce restriction fragments
retinene
Noun
either of two yellow to red retinal pigments formed from rhodopsin by the action of light
residual oil
Noun
oil products that remain after petroleum has been distilled
ridge tile
Noun
a decorative tile that is bent in cross section
resid
Noun
oil products that remain after petroleum has been distilled
roofing material
Noun
building material used in constructing roofs
rose quartz
Noun
a translucent rose-red variety of quartz used for ornaments
ruddle
Noun
a red iron ore used in dyeing and marking
ruddle
Verb
redden as if with a red ocher color
ruddle
Verb
twist or braid together, interlace
reddle
Noun
a red iron ore used in dyeing and marking
raddle
Noun
a red iron ore used in dyeing and marking
raddle
Verb
mark or paint with raddle
raddle
Verb
twist or braid together, interlace
rutile
Noun
a mineral consisting of titanium dioxide in crystalline form
rainwater
Noun
drops of fresh water that fall as precipitation from clouds
reverse transcriptase
Noun
a polymerase that catalyzes the formation of DNA using RNA as a template
rotenone
Noun
a white crystalline insecticide that has low toxicity for mammals
resorcinolphthalein
Noun
a yellow dye that is visible even when highly diluted
radiopaque dye
Noun
dye that does not allow the passage of X rays or other radiation