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ruel-bone

ruel-bone Obs.
  Forms: 4–5 rouwel, rowel, roelle, ruel(l, rewel(l, reuyll bone (boon).
  [f. ruel n. + bone n.]
  Ivory (possibly that of the narwhal).

13.. Leg. Pope Gregory (Schulz) 994 Briȝter þan þe rouwel-boon. c 1350 Ipomadon 6456 A sadull all off sylke, The sege off rewell bone. c 1386 Chaucer Sir Thopas 167 His sadel was of rowel [varr. rewel, ruel] boon. a 1400 Sir Degrev. 1429 [The chamber] was buskyd above With besauntus ful bryȝth All off ruel bon. a 1400 Tourn. Tottenham 83 in Hazl. E.P.P. III. 86 A garland on hir hed full of ruell bones. c 1425 Thomas of Erceld. (Thornton) 49 Hir selle it was of roelle bone [Camb. reuyll bone].

Oxford English Dictionary

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