noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A radioactive isotope of uranium, ²³⁴₉₂U, having a half-life of about 250,000 years; it accounts for about 55 parts per million of natural uranium; it is a member of the uranium-238 decay chain (aka "uranium series"). uncountable

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.