also: そほん
noun
Chinese classic without reading aids; book without reading aids
Refers to a Chinese classic or book that lacks kunten (reading marks) or other aids for Japanese readers. Contrasts with 無点本 (mutenbon).
See also: 無点本
この素本には訓点が一切付いていない。
This Chinese classic has no reading marks at all.
素本を読むには漢文の素養が必要だ。
Reading a book without reading aids requires knowledge of classical Chinese.
無点本 is a synonym also meaning a book without reading marks, but 素本 may be less common.
From 素 (su, 'plain, unadorned') + 本 (hon, 'book'). The reading すほん is standard; そほん is a variant reading.