ventifactn.

1911 J. W. Evans in Geol. Mag. 5th Decade 8 335 If a general expression be required for any wind-shaped stone, we might speak of a ‘ventifact’, on the analogy of artifact, sometimes spelt ‘artefact’,..and of ‘ventiduct’, which has been employed in architecture.

1935 Times 28 Jan. 15/4 Dr. Spencer brought back many fine examples on wind-worn rock and ventifacts for further study.

1944 A. Holmes Princ. Physical Geol. xiii. 258 Such wind-faceted pebbles, which often resemble Brazil nuts,..are known as dreikanter or ventifacts.

1949 K. P. Oakley Man the Tool-maker ii. 10 Stones splintered by fire, or faceted by sandstorms (ventifacts or dreikanters) are occasionally mistaken for the work of man.

1970 R. J. Small Study of Landforms ix. 301 Such abrasion is capable of..shaping individual boulders and small stone into ‘ventifacts’, notably the well-known ‘dreikanter’ with their three faceted sides.