Aspherical

Part of speech: adjective

Definitions

1. A form distinct from a sphere is defined by its uneven surfaces or angles that do not conform to a uniform roundness
2. An object that is not perfectly round exhibits irregularities in curvature or proportions across its structure
3. A shape that diverges from the standard sphere demonstrates variations in its curvature and lacks a uniform roundness throughout its design

Etymology: "Aspherical" is simply "a-" attached to "spherical," with the "a-" prefix meaning "not" or "without." Spherical comes from the Greek "sphaira," meaning ball or globe, so the whole word literally says "not ball-shaped." The prefix is the same one found in words like "asymmetrical" and "amoral," and it lets English build a negative description of a shape from an existing adjective without needing a separate coinage. Because the word is a plain negation of "spherical," its meaning follows directly from that base: something aspherical departs from a perfect sphere, whether in the curve of a lens, the outline of a planet or the contour of an object. Its sense is therefore literal and descriptive, with no surprising shift in meaning along the way.

Synonyms: non-spherical, irregular, deformed, ellipsoidal, oblate

Antonyms: spherical, round, circular, globular, ball-shaped