Emily Dickinson Lexicon

STEAR-IN, n. [Gr. στεαρ, suet.]

One of the proximate principles of animal fat, as lard, tallow, &c. The various kinds of animal fat commonly consist of two substances principally, viz. stearin and elain; of which the former is solid and the latter liquid. In particular instances, several other different and distinct proximate principles are found in animal fats. – D. Olmsted.