pair of wooden interior doors
Refers to a pair of wooden doors used inside traditional Japanese homes, often separating rooms. A specialized architectural term.
door to a Heian-period pavilion
Specifically a door to a pavilion in a shinden-zukuri style palace of the Heian period. Historical term; see 寝殿造.
See also: 寝殿造り
In old Japanese houses, tsumado were used as room dividers.
In shinden-zukuri buildings, one could go out into the garden through the tsumado.
The term 妻戸 (つまど) likely derives from 妻 (つま, 'side' or 'gable end') and 戸 (と, 'door'), referring to doors placed at the gable ends of a building. The exact historical derivation is uncertain.