one-eggadj.
/ˈwʌnɛɡ/, U.S. /ˈwənˈɛɡ/ 1. Characterized by or consisting of a single egg.
ΘΚΠ
the world > animals > birds > egg > [adjective] > characterized by single egg
one-egg1914
1914 Jrnl. Ecol. 2 19 Of the one-egg clutches we have no proof as to how many consisted of one originally.
1916 Sci. Monthly Dec. 565 Many persons..will nevertheless find a one-egg serving of scrambled egg too small.
1953 N. Tinbergen Herring Gull's World xvi. 132 In the one-egg phase the bird often stands a few feet away from the nest.
1998 Jrnl. Animal Ecol. 67 832/2 The survival cost for adults from one-egg nests [was not] significantly different than that of adults from two-egg nests.
2. Of a twin: monozygotic.
ΘΚΠ
the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [adjective] > zygote or syngamete > monozygosity, etc.
binovular1900
uniovular1904
heterozygotic1911
monozygotic1916
one-egg1921
homozygotic1927
dizygotic1930
monozygous1931
monovular1932
dizygous1940
monozygote1955
two-egg1959
1921 Science 28 Oct. 395/1 One-egg twins arise by a division into two embryos of a single young embryo.
1959 Listener 29 Oct. 729/1 One-egg twins, being genetically identical, have exactly the same blood and tissue antigens.
1995 P. A. Tyler in C. Hollin Contemp. Psychol. vi. 118 The comparison of different sorts of twins, monozygotic (one-egg or identical) and dizygotic (two-egg or fraternal).
This entry has been updated (OED Third Edition, June 2004; most recently modified version published online March 2022).
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adj.1914