Trehala \Tre*ha"la\, n. (Chem.)
An amorphous variety of manna obtained from the nests and
cocoons of a Syrian coleopterous insect ({Larinus maculatus},
{Larinus 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}.
[1913 Webster]