English
extrasellar
From extra- + sellar.
Proto-Indo-European *h₁éǵʰs ‘out’
Proto-Indo-European *h₁eǵʰsteros
Proto-Italic *eksteros
Latin exter ‘being on the outside’
Latin extrā ‘outside, except, beyond’
English extra-
Proto-Indo-European *sed- ‘to sit’
Proto-Indo-European *sedleh₂
Proto-Italic *sedlā
Latin sella ‘seat, chair’
Latin sellāris ‘of or belonging to a seat’
English sellar
Today it means
adj Beyond the sella turcica
Language periods are conventional ranges, not dates for this word.
Etymograph / extrasellar