Bible Dictionaries
Seal (2)

Webster's Dictionary

A compound hydraulic valve for regulating the passage of the gas through a set of purifiers so as to cut out each one in turn for the renewal of the lime.

Bibliography Information
Webster, Noah. Entry for 'Seal (2)'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​s/seal-2.html. 1828.