γραπτέον

α, ον
A. one must write or describe, ὅπως . . X. Eq. 2.1; one must write, spell, Str. 9.4.5, Gal. 15.720.
2. γραπτέος,α, ον, to be written, described, Pl. Ep. 341d, Luc. Im. 17.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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