Radicchio (1887, 1926, 1976)

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   "Radicchio" is sold everywhere now.  OED added it in 1993; 1978 is in brackets, and then the first citation is 1981.  Merriam-Webster has 1968.
   This is from JSTOR:


1.
History of Garden Vegetables (Continued)
E. Lewis Sturtevant
American Naturalist, Vol. 21, No. 8. (Aug., 1887), pp. 701-712.
(Pg. 712: "The chicory, or succory is called, in France, _chichoree sauvage_, _chicoree amere_, _chicoree barbe de capucin_; in Germany, _wilde_ or bitter _Cichorie_; in Denmark, _Cichorie_; in Italy, _cicoria selvatica_, _radicchio radicia_;..."--ed.)

2.
(in Reviews)
An Italian Dictionary
Alfred Hoare
Review author[s]: Rudolph Altrocchi
Modern Philology, Vol. 24, No. 2. (Nov., 1926), pp. 221-233.
(Pg. 229:  "_Radicchio_, add: 'a sort of chicory eaten as salad.'"--ed.)

3.
Linea della poesia pascoliana
Aldo Vallone
Italica, Vol. 40, No. 2. (Jun., 1963), pp. 145-163.


   The first NEW YORK TIMES citation is a little later:

   12 September 1976, NEW YORK TIMES, pg. 214:
   "Here is radicchio," she would exclaim, waving a red-laced member of the lettuce family in the air.