Adjective modifier

• royal: Buckram, royal octavo, 490 p. , with 42 illustrations.

• choral: Choral octavo: 2 or 3-Part, or SATB in any combination of voices.

Modifies a noun

• volume: He is writing four octavo volumes about me, and he has been at my elbow two and one-half years.

• edition: Although they collated the 1646 octavo edition of the poems with Bodl.

• size: Sheets of paper folded into octavo size with eight pages of writing.

• page: I wrote forty-eight of the printed octavo pages of the life of Savage at a sitting; but then I sat up all night.

• book: Thus the first and eighth leaves of a section of an octavo book will be conjugate.