Definition of "ditriglyphic"

How intercolumniation is regulated in the Doric Order has been already explained at page 20: in that, the distances between the columns is governed entirely by the triglyphs of the frieze, so that there can be no medium between monotriglyphic and ditriglyphic intercolumniation, accordingly as there is either one or two triglyphs over each intercolumn.

1852, William Henry Leeds, Rudimentary Architecture. The orders and their æsthetic principles