AZOLE n.
Any of a large class of compounds characterized by a five- membered ring which contains an atom of nitrogen and at least one other noncarbon atom (nitrogen, oxygen, sulphur). The prefixes furo-, thio, and pyrro-are used to distinguish three subclasses of azoles, which may be regarded as derived respectively from furfur…
BARREL n.
The hollow basal part of a feather. Barrel bulk (Com.), a measure equal to five cubic feet, used in estimating capacity, as of a vessel for freight. -- Barrel drain (Arch.), a drain in the form of a cylindrical tube. -- Barrel of a boiler, the cylindrical part of a boiler, containing the flues. -- Barrel of the ear…