The young fruit of a variety of small, dark green cucumbers especially grown to make pickles. Gherkins are usually sold in jars, packed in pickling brine. Cornichons are the French version of this pickle.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.