Lettuce opium

Also found in: Encyclopedia, Wikipedia.
See Lactucarium.

See also: Lettuce

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
In their natural, wild forms, the various species of lettuce contain high levels of a narcotic drug called lactucarium that was known as lettuce opium.
WILD LETTUCE OR LETTUCE OPIUM: This has been used for hundreds of years as an aphrodisiac.