convex

This term describes a surface that bulges toward the observer, creating a physical sensation of expansion or protrusion. It is most frequently encountered in optics and geometry to describe the specific way a surface interacts with light or space. In practical application, the word carries a clinical, precise connotation. It is rarely used in casual conversation unless referring to specific objects like lenses or architectural domes, where it serves as the direct technical opposite of a concave shape.