Human Research Facility
health-related fitness
Heart rate fluctuations
homologous restriction factor
Human Resource Facility
haemodynamic response function
health-related facility
Heidelberg Retina Flowmeter
Heidelberg retinal flowmeter
height ranger finder
Height-Range Finder
hemodynamic response function
hepatorenal failure
Herb Research Foundation
High Readiness Force
histamine releasing factor
histamine-releasing factor
histamine-releasing factors
Hitachi Raster Format
human readable format
human relevance framework
Humanitarian Response Fund