脇戸 is read as わきど (wakido) and means side door.
わきど
wakido
わき
second verse (in a linked series of poems)
わきやく
supporting role (actor)
わきみ
looking aside
いど
water well
と
door (esp. Japanese-style)
あまど
sliding storm shutter
ひきど
sliding door
あみど
window screen
げこ
non-drinker
えど
Edo (shogunate capital, now Tokyo)
もんこ
door
がらすど
glass door