Wiktionary
bible leaf
n. (taxlink Tanacetum balsamita species noshow=1), a Eurasian perennial herb that has flowers that are yellow and buttonlike.
WordNet
bible leaf
n. tansy-scented Eurasian perennial herb with buttonlike yellow flowers; used as potherb or salad green and sometimes for potpourri or tea or flavoring; sometimes placed in genus Chrysanthemum [syn: costmary, alecost, mint geranium, balsam herb, Tanacetum balsamita, Chrysanthemum balsamita]
Usage examples of "bible leaf".
It is not impossible that the inventor had only part of the formula he so closely guarded written on the Bible leaf and the other part of it in that vault, together with other valuable documents.