English
intra-atrial
From intra- + atrial.
Proto-Indo-European *h₁én ‘in’
Proto-Indo-European *h₁énteros ‘inside, within’
Latin *interus
Latin intrā ‘within’
English intra-
Today it means
adj Within an atrium, typically of the heart.
Language periods are conventional ranges, not dates for this word.
Etymograph / intra-atrial