The phenomenon occurring when the Sun does not set but only approaches the horizon at midnight; it occurs near the summer solstice in the polar regions.

(linguistics) One of fourteen Arabic letters that cause the "L" of a preceding definite article اَل (al-) to be assimilated in pronunciation. The sun letter suppresses the sound of the "L" and then geminates: al + ṣīn = aṣ-ṣīn. The effect of the sun letter is limited to pronunciation and does not affect the spelling, except that a shadda may be written over the sun letter and in the fully vocalised spelling lām lacks any diacritics: الصِّين (aṣ-ṣīn). The fourteen sun letters are ت (t), ث (ṯ), د (d), ذ (ḏ), ر (r), ز (z), س (s), ش (š), ص (ṣ), ض (ḍ), ط (ṭ), ظ (ẓ), ل (l), ن (n). Phonetically, they represent coronal consonants.

Either of two bright spots, caused by the refraction of sunlight through ice crystals, sometimes seen on the parhelic circle.

plural of sun letter

A medical cure or programme of recovery involving exposure to sunlight.

Iced tea brewed by placing the tea in a large container with water and leaving it in the sun.

plural of sun-stead. (Alternative form of sunsteads.)

plural of sun gear

The central gear wheel of an epicyclic gear train; the central gear in planetary gear box, which spins the planet gears

plural of sun spider