The Collaborative International Dictionary of English v.0.48:

Solar \So"lar\, n. [OE. soler, AS. solere, L. solarium, from sol
   the sun. See Solar, a.]
   A loft or upper chamber; a garret room. [Obs.] [Written also
   soler, solere, sollar.] --Oxf. Gloss.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Soler \So"ler\, Solere \So"lere\, n. [OE. See Solar, n.]
   A loft or garret. See Solar, n. --Sir W. Scott.
   [1913 Webster]