moonful adjective 2noun 1forms 1 adjective2 •Marked by the presence of the moon.She sobbed herself to sleep and then dreamed she was walking on a beach on a moonful night, a strange but distantly known city on the horizon. — 1986 •Resembling the moon in some manner, such as being round, bright, etc.The cattle-shed is equally curious, containing specimens of the genus Bos, the Brahmin cattle with their mild moonful eyes, […] — 1866 noun1 •An amount sufficient to fill the moon.For suggestion of what one may really do, and for impelling one toward the practicable best, I find this book worth a moonful of " Consuelos." — 1865 formsmoonfuls