This is the word appeared in 'Hiyuhon' (the third chapter) of "Lotus Sutra," which suggests the situation that the tea ceremony of that time aimed at theorization using the Buddhism.
これは『法華経』の「譬喩品」に登場する言葉であり、当時の茶道が仏教を用いた理論化を目指していた状況を窺わせる。