The simplest optical instrument, a hand-held converging lens used to produce a magnified, erect and virtual image. The image, being virtual, or an illusion created by the refraction of light rays in the lens, can only be seen by looking through the magnifying glass.

ETYM AS. wenn; akin to Dutch wen, LG. wenne.
(Homonym: when).
A benign cyst formed by excretions from a sebaceous gland.
Enormously congested city.