(weather) Hot and humid. / (weather) Very hot and dry; torrid. / (figuratively) Sexually enthralling.

The magnesium salt of sulfuric acid (chemical formula MgSO₄), commonly called Epsom salts.

In a sulky manner.

Having a brooding ill temper; sulky. / Gloomy; dismal; foreboding. / Sluggish; slow. / (obsolete) Lonely; solitary; desolate. / (obsolete) Mischievous; malignant; unpropitious.

(obsolete) One who is solitary, or lives alone; a hermit. / (chiefly in the plural) Sullen feelings or manners; sulks; moroseness.

An ionic detergent, sodium dodecyl sulfate, used in many household products.

A sovereign or vassal princely state—usually Muslim—where the ruler is styled sultan. / The office or position of sultan.

(historical) The holder of a secular office, formally subordinate to, but de facto the power behind the throne of, the caliph.

(chiefly Britain) Alternative spelling of sulfur nitride

(chemistry) a simple binary compound of sulfur and nitrogen, S₄N₄, having a ring structure; it is explosive / (chemistry) an inorganic polymer, [SN]ₙ, that has metallic properties