A variant or obsolete term, possibly related to atria (the chambers of the heart) or architectural atriums.
This appears to be a rare, archaic, or dialectal variant of 'atrium' (plural atria), from Latin atrium meaning 'entrance hall.' The singular form is uncertain and may be obsolete.
Atry is a ghostly word from English's past—it might be a historical variant of atrium that fell out of favor as medical and architectural terminology standardized. Finding such words is like discovering the linguistic equivalent of a fossil.
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