|See also electromagnetic radiation a wave of energy propagated in an electromagnetic field|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.|
A wave of energy consisting of electric and magnetic fields, oscillating at right angles to each other. See more at electromagnetic radiation.