Under-surface

(UNDER-¹ 5 b.) Also freq. as two words: see UNDER a. 2 b.

1

1733. Tull, Horse-Hoeing Husb., xxv. 404. The Under-surface of the Limbers … parallel … to the Upper-surface … of the Beam.

2

1836–9. Todd’s Cycl. Anat., II. 861/2. The pro-sternum or under-surface of the prothorax.

3

1853. Markham, Skoda’s Auscult. & Percuss., 214. Murmurs are produced at the aortic valves, when their under-surfaces are roughened.

4