SEXTODECIMO a. 2 definitions
Having sixteen leaves to a sheet; of, or equal to, the size of one fold of a sheet of printing paper when folded so as to make sixteen leaves, or thirty-two pages; as, a sextodecimo volume.
SHOAL n.
f a sea, lake, river, pond, etc., is shallow; a shallow. The depth of your pond should be six feet; and on the sides some shoals for the fish to lay their span. Mortimer. Wolsey, that once trod the ways of glory, And sounded all the depths and shoals of honor. Shak.