(organic chemistry) The cage compound 1-(2,3,4,5,6,7-hexahydro-1H-tricyclo[2.2.1.0^{{2,6}]heptan-3-yl)-1-phenyl-3-piperidin-1-ylpropan-1-ol,} normally available as the chloride

plural of diminished fourth

(US) Acronym of Transportation Research Information Services.

(rare) hired, employed (for wages)