English

isospin

Blend of isotopic + spin.

Proto-Indo-European *(s)penh₁- ‘to twist’

Proto-Germanic *spinnaną ‘to spin’

Old English spinnan ‘to spin’

Middle English spinnen ‘to spin or convert fibre into yarn’

English spin

Today it means

noun A quantum number or symmetry related to the strong interaction and hence to differences between atoms with the same number of nucleons.

Language periods are conventional ranges, not dates for this word.