di·​glyph | \ ˈdīˌglif\
plural -s

Definition of diglyph

: a projecting ornamental face like the triglyph but having only two grooves

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First Known Use of diglyph

1728, in the meaning defined above

History and Etymology for diglyph

Greek diglyphos doubly indented, from di- + -glyphos (from glyphein to carve or hollow out) (split)

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The first known use of diglyph was in 1728

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