(adjective) : solstĭtĭālis, e, solstitium.
* Lit., of or belonging to the summer solstice, solstitial (opp. brumalis): (sol) Brumales adeat flexus, atque inde revortens Cancri se ut vortat metas ad solstitiales,Lucr. 5, 617: dies,the day on which the sun enters Cancer, the longest day,Cic. Tusc. 1, 39, 94: tempus,Ov. F. 6, 790; Vitr. 9, 5: nox,i. e. the shortest,Ov. P. 2, 4, 26: ortus sideris,Just. 13, 7, 10: circulus,the tropic of Cancer,Varr. L. L. 9, § 24 Müll.; Plin. 2, 11, 8, § 50.—Called also orbis, Cic. N. D. 3, 14, 37: exortus,the point where the sun rises at the summer solstice,Plin. 18, 34, 77, § 333.
* Transf.
* Of or belonging to midsummer or summer heat: herba, i. e. a summer plant or one that quickly withers, Plaut. Ps. 1, 1, 36; Aus. Prof. 6, 35; Plin. 26, 5, 14, § 26: spinae,Col. 2, 17, 1: acini,Plin. 14, 16, 18, § 99: tempus,Liv. 35, 49 Drak.: caput Leonis,Luc. 6, 338: morbus,the midsummer fever,Plaut. Trin. 2, 4, 143.
* Of or belonging to the sun, solar (for solaris): annus, qui solstitiali circumagitur orbe,in a solar revolution,Liv. 1, 19, 6; for which, annus,Serv. A. 4, 653: plaga,i. e. the south,Sol. 25.