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., Solar So"lar, a. [L. solaris, fr. sol the sun; akin to As. s[=o]l, Icel. s[=o]l, Goth. sauil, Lith. saule, W. haul,. sul, Skr. svar, perhaps to E. sun:F. solaire. Cf. Parasol. Sun.] 1. Of or pertaining to the sun; proceeding from the sun; as, the solar system; solar light; solar rays; solar influence. See Solar system, below. 2. (Astrol.) Born under the predominant influence of the sun. [Obs.] And proud beside, as solar people are. --Dryden. 3. Measured by the progress or revolution of the sun in the ecliptic; as, the solar year. 4. Produced by the action of the sun, or peculiarly affected by its influence. They denominate some herbs solar, and some lunar. --Bacon. Solar cycle. See under Cycle. Solar day. See Day, 2. Solar engine, an engine in which the energy of solar heat is used to produce motion, as in evaporating water for a steam engine, or expanding air for an air engine. Solar flowers (Bot.), flowers which open and shut daily at certain hours. Solar lamp, an argand lamp. Solar microscope, a microscope consisting essentially, first, of a mirror for reflecting a beam of sunlight through the tube, which sometimes is fixed in a window shutter; secondly, of a condenser, or large lens, for converging the beam upon the object; and, thirdly, of a small lens, or magnifier, for throwing an enlarged image of the object at its focus upon a screen in a dark room or in a darkened box.