sunbathn.
/ˈsʌnbɑːθ/, /ˈsʌnbaθ/, U.S. /ˈsənˌbæθ/ A period of exposing the body to the sun, originally as a method of medical treatment. Now esp.: a period of sunbathing (cf. sunbathe n.).
ΘΚΠ
the world > matter > properties of materials > temperature > heat > heating or making hot > subjection or exposure to heat or fire > [noun] > to heat of sun > sun-bathing
aprication1623
sunbathing1814
sunbath1816
sunbaking1910
1816 Eclectic Repertory & Analyt. Rev. July 409 The preference of this sun-bath to the usual method of insolation amongst the ancients consists in the more effectual application of the sun-beams upon the naked body.
1866 Galaxy 15 July 544 What you want..is a sun-bath daily.
1893 K. Sanborn Truthful Woman S. Calif. 21 I sat on the veranda,..taking a sun-bath, in a happy dream or doze.
1965 S. d'Estrée tr. ‘P. Réage’ Story of O iv. 177 In the morning when she knew that O was taking a sunbath on the terrace, she came out and lay down beside her.
2000 Dawn (Karachi) 16 Apr. (Mag.) 5/7 To meet the philosopher, Alexander went out in his search and found him taking a sunbath stark naked.
This entry has been updated (OED Third Edition, January 2018; most recently modified version published online March 2022).
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n.1816