unribbedadj.
/(ˌ)ʌnˈrɪbd/, U.S. /ˌənˈrɪbd/ Not ribbed.
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the world > space > relative position > support > [adjective] > not supporting or supported
unribbed1775
unsustaining1818
unbuttressed1849
1775 J. Ash New Dict. Eng. Lang. Unribbed, not ribbed.
1827 T. Nuttall Introd. Systematic & Physiol. Bot. xvi. 80 An oblong solid, unribbed fruit, closely armed with hooked bristles.
1834 K. H. Digby Mores Catholici V. viii. 288 See, then to what a distance your unribbed bark is driven.
1851 J. Ruskin Stones of Venice I. xxix. 334 When the vaulting is unribbed, as in plain waggon vaults.
1911 G. H. West Gothic Archit. in Eng. & France iv. 70 A large unribbed vault built of rubble is a very weak construction.
1970 N. Pevsner Cambridgeshire (Buildings of Eng.) (ed. 2) 528/2 The waterleaf is a broad, unribbed, tapering leaf curving up towards the angle of the abacus and turned in at the top.
2006 Best Life Mar. 71/2 A sensation that blows one woman away will make another one tap her fingers, and that certainly holds true in the case of ribbed versus unribbed.
This entry has been updated (OED Third Edition, December 2014; most recently modified version published online December 2021).
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adj.1775