This entry examines the verb dahaha in Surah an-Nazi'at 79:30 — "and after that He spread the earth" — and the popular modern claim that the word describes an egg-shaped Earth. The claim rests on a folk etymology rejected by classical lexicography, and this entry foregrounds that objection from the start.
The source text
وَٱلْأَرْضَ بَعْدَ ذَٰلِكَ دَحَىٰهَآ
“And after that He spread the earth.”
Qur'an 79:30 · Saheeh International
What was understood in the seventh century
In classical Arabic the verb daha means to spread, level or smooth out, and the classical exegetes read 79:30 as God spreading the earth out as a habitable expanse — consistent with the general ancient Near Eastern picture of a spread-out earth. A related noun, udhiyy, denotes the ground nest an ostrich flattens for its eggs, and this word is the linguistic hook on which the modern popular claim hangs. Pre-modern translations and commentaries show no trace of an egg reading; the verse's concern throughout is the earth made habitable and spread out.
The modern correspondence
A widely circulated modern argument holds that dahaha derives from or evokes duhya/udhiyy, words associated with ostrich eggs, and therefore that the verse describes the earth as egg-shaped, anticipating the planet's true figure. The claim's popularity dates to late twentieth-century apologetic media, where it spread widely through pamphlets, lectures and, later, online video.
The underlying geodesy is sound in itself: the Earth is an oblate spheroid, very slightly flattened at the poles, with an equatorial radius about 21 kilometres greater than the polar radius — a shape predicted by Newton in 1687 and confirmed by the French geodesic expeditions of the 1730s (see the reference on the figure of the Earth below). Because the geodetic facts are secure, the argument stands or falls entirely on the linguistics — on whether dahaha can be made to carry a shape at all.
Considerations and counterpoints
Critics, including many Arabic-speaking scholars, point out that daha simply means "to spread out": the udhiyy is the flattened patch of ground where the ostrich lays, not the egg itself, so the verse affirms spreading, not sphericity. Every classical translation and tafsir renders it that way. There is also a decisive physical mismatch: an ostrich egg is prolate — elongated along its axis — while the Earth is oblate, flattened at the poles, so even granting the etymology the shape would be wrong. This item is included because of its ubiquity in popular apologetics, with the honest assessment that the egg-shape reading is linguistically unsound; the presentation here accordingly foregrounds the linguistic objection rather than the geodesy.
Credibility rating: Tier 3 · Contested — The egg-shape reading rests on a folk etymology rejected by classical lexicography, and an ostrich egg (prolate) is in any case the wrong shape for the oblate Earth.