Etymology From Middle English leme, from Old English lēoma (“ray of light, beam, radiance, gleam, glare, lightning”), from Proto-Germanic *leuhmô (“light, shine”), from Proto-Indo-European *leuk- (“light, bright”). Cognate with Icelandic ljómi (“gleam, ray, beam, flash of light”), Latin lumen (“light”).
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UK, Dialectal A gleam or flash of light; a glow or glowing.
The Leams of the morning sun streamed through the half-closed shutters1816, [Walter Scott], The Antiquary. […], volume (please specify |volume=I to III), Edinburgh: […] James Ballantyne and Co. for Archibald Constable and Co.; London: Longman, Hurst, Rees, Orme, and Brown, →OCLC:
The horsemen spreading themselves along the side of the cover, waited untill the keeper entered, leading his ban-dog; a large blood-hound tied in a leam or band, from which he takes his name.1808, Joseph Strutt, [Walter Scott], “Section [IX]. Chapter II.”, in [Walter Scott], editor, Queenhoo-Hall, a Romance: And Ancient Times, a Drama. […], volume IV, Edinburgh: […] [James Ballantyne & Co.] for John Murray, […]; and Archibald Constable & Co. […], →OCLC, pages 48–49: