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1837, William Whewell, “Earliest Stages of Astronomy”, in History of the Inductive Sciences, from the Earliest to the Present Times., volume I, London: John W Parker,; Cambridge, Cambridgeshire: J. and J. J. Deighton, →OCLC, book III (History of Greek Astronomy), section 9 (The Globular Form of the Earth), page 150:
[D]rops of water naturally form themselves into figures with a convex surface; […]
(mathematics,not comparable, of a set in Euclidean space) arranged such that for any two points in the set, a straight line between the two points is contained within the set.