(paper, printing) A sheet of paper 7 to 10 inches (= 17.78 to 25.4 cm) high and 4.5 to 6 inches (= 11.43 to 15.24 cm) wide, the size varying with the large original sheet used to create it. It is made by folding the original sheet three times to produce eight leaves.

plural of octavo

(paper) A paper size, (2.5"-3.1" x 2.5"-3.3"), one forty-eighth of a standard uncut flat sheet. / (printing) A book size, (2.5"-3.1" x 2.5"-3.3"), corresponding to the paper size.

plural of quadragesimo-octavo

(sports, US) A match or game between two of the last sixteen competitors in a given tournament or sporting competition.

plural of octavofinal

(zoology) octaval and lateral: Used exclusively to describe a structure in the brains of fishes, namely the medial octavolateral nucleus or the dorsal octavolateral nucleus, both analogus to the mammalian cerebellum.