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Definition of thulium : A rare metallic element of uncertain properties and identity, said to have been found in the mineral gadolinite.

Synonyms:

atomic number 69, Tm

europium, iodine, cobalt, zinc, neodymium, arsenic, carbon, argon, beryllium, silicon, plutonium, boron, praseodymium, phosphorus, antimony, protactinium, americium, chlorine, strontium, manganese, technetium, cadmium, erbium, copper, tantalum, potassium, lutetium, cesium, fermium, germanium, neptunium, osmium, lead, terbium, oxygen, mendelevium, californium, rhenium, xenon, berkelium, curium, thorium, rubidium, lithium, gallium, niobium, magnesium, mercury, iron, uranium, palladium, tin, bromine, tellurium, cerium, krypton, nickel, holmium, samarium, polonium, rhodium, thallium, helium, nobelium, sodium, hydrogen, indium, neon, gold, hafnium, vanadium, silver, bismuth, molybdenum, radon, ytterbium, einsteinium, gadolinium, calcium, nitrogen, platinum, titanium, dysprosium, lanthanum, francium, iridium, chromium, scandium, aluminum, yttrium, tungsten, selenium, astatine, actinium, sulfur, fluorine, barium, radium, zirconium, ruthenium, element, promethium