• a light strong grey lustrous corrosion-resistant metallic element used in strong lightweight alloys (as for airplane parts); the main sources are rutile and ilmenite
Example sentence
• Many aircraft and spacecraft use titanium for its durability.
• (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants
Example sentence
• A single bacterium can multiply into millions within a few hours.
• a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol)
Example sentence
• The element mendelevium is named after the Russian chemist Dmitri Mendeleev.
• a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
• a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite
Example sentence
• The rubidium atom has 37 electrons and 37 protons.
• a brittle silver-white metalloid element that is related to selenium and sulfur; it is used in alloys and as a semiconductor; occurs mainly as tellurides in ores of copper and nickel and silver and gold
Example sentence
• The melting point of tellurium is approximately 449.5 degrees Celsius.
• a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc.
Example sentence
• The metal osmiridium is often found in association with platinum.
• a permanent executive committee in socialist countries that has all the powers of some larger legislative body and that acts for it when it is not in session
Example sentence
• The praesidium was responsible for maintaining security in the city.
• either of two thickened triangular layers of conjunctiva extending from the nasal edge of the eye to the cornea; it arises from irritation of the pinguecula
Example sentence
• He went to the doctor to have his pterygium examined.
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