ISODIAPHERE

ˌ ̷ ̷ ̷ ̷ˈdīəˌfi(ə)r noun

( -s )

Etymology: is- + -diaphere (from Greek diapherein to differ, carry across, from dia- + pherein to carry) — more at bear

: a nuclear species that has the same isotopic number as one or more other nuclear species