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From The Collaborative International Dictionary of English v.0.48:
Wardian \Ward"i*an\, a. Designating, or pertaining to, a kind of glass inclosure for keeping ferns, mosses, etc., or for transporting growing plants from a distance; as, a Wardian case of plants; -- so named from the inventor, Nathaniel B. Ward, an Englishman. [1913 Webster]