• Webster's Revised Unabridged Dictionary
    • Theriac (Old Med) An ancient composition esteemed efficacious against the effects of poison; especially, a certain compound of sixty-four drugs, prepared, pulverized, and reduced by means of honey to an electuary; -- called also theriaca Andromachi, and Venice treacle.
    • a Theriac Of or pertaining to theriac; medicinal. "Theriacal herbs."
    • Theriac Treacle; molasses.
    • ***
Century Dictionary and Cyclopedia
    • theriac Same as theriacal.
    • n theriac A composition regarded as efficacious against the bites of poisonous animals; particularly, theriaca Andromachi, or Venice treacle, which is a compound of sixty to seventy or more drugs, prepared, pulverized, and reduced by the agency of honey to an electuary.
    • ***
Chambers's Twentieth Century Dictionary
    • adjs Theriac medicinal
    • ***


Webster's Revised Unabridged Dictionary
L. theriaca, an antidote against the bite of serpents, Gr. : cf. F. thériaque,. See Treacle
Chambers's Twentieth Century Dictionary
L.,—Gr. thēriakēthērion, a wild beast.


In literature:

Some of them, suspecting poison, treated the wounds with theriac and antidotes.
"Renaissance in Italy, Volumes 1 and 2" by John Addington Symonds
The line is from Nicander Theriac.
"Plutarch's Morals" by Plutarch
There were Theriac or Mithridatum, Hiera Picra (or Holy Bitters), and Terra Sigillata.
"Old English Patent Medicines in America" by George B. Griffenhagen
Galen's theriac, 20, 46, 51, 59, 71.
"Psychotherapy" by James J. Walsh
Thinking it must be some snake that had bitten her, I gave her a dose of the theriac mixed with meal and water.
"La Salle and the Discovery of the Great West" by Francis Parkman