transactinide

Definitions of transactinide

1. noun

   any of the artificially produced elements with atomic numbers greater than 103
   type of:

   chemical element, element

   any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
2. adjective

   of or belonging to the elements with atomic numbers greater than 103