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Armstrong, Lilias E. (1940). The Phonetic and Tonal Structure of Kikuyu, p. 363. Rep. 1967. (Also in 2018 by Routledge).
Latin
Etymology
From Proto-Italic*rougā, from Proto-Indo-European*h₁roug-h₂-(“wrinkle”), related to *h₁rewg-(“to roar, belch”), where the sense development would be "to belch" → "to undulate" → "to be rugged" → "crease, wrinkle". Compare ructo(“I belch, bring up noisily”).
“ruga”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
“ruga”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
ruga in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
“ruga”, in Harry Thurston Peck, editor (1898), Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
The connection between 'to belch' and 'caterpillar' may be the way in which a caterpillar moves forward, viz. by slowly pushing itself foward (sic), first with its hind legs, thus raising the central part of its body to a curve, which is lowered again when the front legs move forward. This movement may easily call into mind the lowering and raising of the Adam's apple when people belch, or retching movements of the throat when vomiting.
^ De Vaan, Michiel (2008) “ruga”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, pages 528-29