• Webster's Revised Unabridged Dictionary
    • n Eserine (Chem) An alkaloid found in the Calabar bean, and the seed of Physostigma venenosum; physostigmine. It is used in ophthalmic surgery for its effect in contracting the pupil.
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Century Dictionary and Cyclopedia
    • n eserine An alkaloid obtained from the Calabar bean, Physostigma venenosum, assumed by some authorities to be identical with physostigmine. It forms colorless bitter crystals, which are an active poison; applied to the conjunctiva, it produces contraction of the pupil.
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Webster's Revised Unabridged Dictionary
From native name of the Calabar bean: cf. F. ésérine,


In literature:

Accurate reports are usually obtained more quickly by means of convex glasses or eserine.
"Schweigger on Squint" by C. Schweigger