English

intermercurial

From inter- + mercurial.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Middle English mercurial ‘a plant, probably the goosefoot (Chenopodium)’

Today it means

adj Between Mercury and the Sun.

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

Etymograph / intermercurial