"right-hand page in an open book" (opposed to verso or reverso), 1824, from Latin recto (in recto folio), ablative of rectum "right," (see right (adj.1)).
例文
1. Recto :Book pages bearing odd page numbers.
奇数ページ:単数ページ番号のあるページ.
2.Due to the impression of recto colon ca with recurrence liver metastasis,he admitted for chemotherapy.