monobrown.
/ˈmɒnə(ʊ)braʊ/, U.S. /ˈmɑnəˌbraʊ/ colloquial (originally U.S.).
A pair of eyebrows that meet above the nose, giving the appearance of a single eyebrow. Also: a person with eyebrows of this type.In quot. 1968 in a science fiction context, apparently denoting a cosmetically applied representation of a single eyebrow.
ΚΠ
1968 J. Sallis in Orbit 4 245 His penciled monobrow flexed at the middle, pointed down. It was like the one-stroke bird that children are taught to draw; the upper part of a stylized heart.
1987 Playboy Sept. 116/3 You can get rid of the monobrow look in a few seconds. Warm wax is dabbed on the unwanted hair and pulled off before the wax hardens.
1995 Los Angeles Times 3 Jan. b1/2 Bubb swears that she, too, inherited the Grant wave and the mono-brow—right after she got three pints of his bone marrow in a transplant.
2000 Herald (Glasgow) (Electronic ed.) 11 Feb. It's said she fell for the monosyllabic monobrow when he ignored her on a plane flight to Scotland.
This is a new entry (OED Third Edition, December 2002; most recently modified version published online March 2022).
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n.1968