Tre‐ha″la (?), n.(Chem.) An amorphous variety of manna obtained from the nests and cocoons of a Syrian coleopterous insect (Larinus maculatus, L. nidificans, etc.) which feeds on the foliage of a variety of thistle. It is used as an article of food, and is called also nest sugar.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.