Japanese book size (approx. 12.5cm × 17.5cm)
A traditional book format roughly half the size of 半紙 (hanshi). The name comes from the resemblance to a slab of konjac (こんにゃく).
See also: 半紙 (はんし)
Edo-period sharebon were published in a small format called konnyakubon.
late Edo-period novelette about the red-light district
By extension, refers to the genre of short, often humorous stories (洒落本) printed in this small format, depicting life in the pleasure quarters.
See also: 洒落本
This konnyakubon wittily depicts exchanges between courtesans and customers in Yoshiwara.
洒落本 is the broader genre of witty Edo-period stories about the pleasure quarters; 蒟蒻本 can refer to the physical book format or, by extension, the same genre.
From 蒟蒻 (konnyaku, 'konjac') + 本 (hon, 'book'), so called because the small, thick book shape resembles a slab of konjac.