Locustic

Lo·cus'tic adjective (Chemistry) Pertaining to, or derived from, the locust; -- formerly used to designate a supposed acid.
Found on http://www.encyclo.co.uk/webster/L/56

Locustic

• (a.) Pertaining to, or derived from, the locust; -- formerly used to designate a supposed acid.
Found on http://thinkexist.com/dictionary/meaning/locustic/
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