svalr

From Proto-Germanic *swalaz (“cool, [originally: burningly] cold”), from *swelaną (“to burn slowly, create a burningly cold sensation”), from Proto-Indo-European *swel- (“to shine, warm up, burn”). Akin to German schwül (“sultry”), Dutch zwoel (“sultry”), and Ancient Greek σέλας (sélas, “luminous”).

svalr (comparative svalari, superlative svalastr)

1. cool, cold
   • Vǫluspá, stanza 3, lines 3–4:

     […] vara sandr né sær
     né svalar unnir […]

     […] there was no sand nor sea
     nor cool waves […]

• svala

• Zoëga, Geir T. (1910) “svalr”, in A Concise Dictionary of Old Icelandic, Oxford: Clarendon Press; also available at the Internet Archive