panic (n.1)

"sudden mass terror," especially an exaggerated fright affecting a number of persons without visible cause or inspired by trifling cause or danger, 1708, from an earlier adjective (c. 1600, modifying fear, terror, etc.), from French panique (15c.), from Greek panikon, literally "pertaining to Pan," the god of woods and fields, who was the source of mysterious sounds that caused contagious, groundless fear in herds and crowds, or in people in lonely spots. In the sense of "panic, fright" the Greek word is short for panikon deima "panic fright," from neuter of Panikos "of Pan."

The meaning "widespread apprehension in a trading community about financial matters" is recorded by 1757. Panic-stricken is attested from 1804. Panic attack attested by 1970. Panic button in a figurative sense is by 1948 in the jargon of jet pilots; the literal sense is by 1965 in reference to prison security.  

And if he gets in a tight spot and doesn't know what to do, he "pushes the panic button for two minutes of disorganized confusion." During his first few weeks he may even find the panic button "stuck in the on position." ["How Jet Jockeys Are Made," Popular Science, December 1948]

panic (n.2)

type of grass, mid-15c., panik, from Old French panic "Italian millet," from Latin panicum "panic grass, kind of millet," from panus "ear of millet, a swelling," from PIE root *pa- "to feed."

panic (v.)

1827, "to afflict with panic," from panic (n.). Intransitive sense of "to lose one's head, get into a panic" is from 1902. Related: Panicked; panicking.

updated on August 19, 2020

Definitions of panic from WordNet
panic (v.)
be overcome by a sudden fear;
The students panicked when told that final exams were less than a week away
panic (v.)
cause sudden fear in or fill with sudden panic;
The mere thought of an isolation cell panicked the prisoners
panic (n.)
an overwhelming feeling of fear and anxiety;
Synonyms: terror / affright
panic (n.)
sudden mass fear and anxiety over anticipated events;
panic in the stock market
Synonyms: scare
Etymologies are not definitions. From, not affiliated with etymonline.