1879 G. M. Hopkins (1967) 80 Only I'll Have an eye to the sakes of him, quaint moonmarks, to his pelted plumage under Wings.
1879 G. M. Hopkins (1955) 83 By moonmarks I mean crescent shaped markings on the quill-feathers, either in the colouring of the feather or made by the overlapping of one on another.
1925 W. A. Cornaby xi. 243 ‘Sun and moon Ming’ on the back, and over it the moonmark made by the thumb-nail of the Heaven King himself.
2015 L. Thomas-Sundstrom v. 61 His moon mark..showed through the colorless fur of his left upper arm.