To effuse is to emit or give off. You know it's truly spring when the cherry trees in your neighborhood start to effuse a wonderfully sweet, floral scent.
When something effuses, it seeps out in a way you can sense. Light effuses through the curtains in the morning, and the smell of waffles effuses from the kitchen on Saturday mornings. You can also describe a quality that emanates from someone using this verb: "My teacher effuses calmness and kindness, which is why everyone loves him." Effuse has a Latin root, effusus, "poured out."