riblessadj.
/ˈrɪblᵻs/, U.S. /ˈrɪblᵻs/ Having no ribs; lacking ribs (in various senses).
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the world > plants > part of plant > part defined by form or function > ridge channel > [adjective] > not having ribs
ribless1777
unkeeled1848
the world > life > the body > structural parts > bone or bones > rib > [adjective] > having no
ribless1777
1777 J. Lightfoot Flora Scotica II. 937 The stalk is commonly about two feet long, and two inches wide, linear, plain, and ribless.
1794 S. T. Coleridge To Young Ass in Morning Chron. 30 Dec. 3/4 Where Toil shall call the Charmer, Health, his Bride, And Laughter tickle Plenty's ribless side!
1796 W. Withering Arrangem. Brit. Plants (ed. 3) IV. 101 Flat wedge-shaped, ribless, thick, very succulent.
1828 J. E. Smith Eng. Flora (ed. 2) II. 3 Seeds ribless, rough.
1854 Orr's Circle Sci., Org. Nat. I. 216 The eight cervical vertebræ are free, moveable, and ribless.
1886 Pall Mall Gaz. 28 July 11/3 Are they flexible, like elastic, or ribless, like a coiling snake, those lumbering vessels?
1917 Amer. Jrnl. Archaeol. 21 372 Pairs of long, ribless leaves extending from a line which circles the design.
1962 P. Frankl Gothic Archit. Introd. 8 Ribless vaults had produced groins which were double-curved and..distorted because of the displacement of the stone masses.
2004 San Francisco Chron. (Nexis) 15 Nov. a6 A ribless, inflatable umbrella that deflates into the size of a baseball.
This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).
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adj.1777