any of the radioactive chemical elements that have atomic numbers higher than that of the highest actinide (lawrencium)
also called transactinide element
Origin of transactinidesee trans- (sense )
Of or belonging to the series of elements whose atomic numbers are greater than 103.
(comparative more transactinide, superlative most transactinide)
- (chemistry, physics) Lying beyond actinium in the periodic table; having an atomic number greater than 103.
trans- +"Ž actinide