HH.D.

1.
Doctor of Humanities.

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Hhe
Health Hazard Evaluation Program
HHFA
1. Housing and Home Finance Agency. Housing and Home Finance Agency
H-hinge
[eych-hinj] /ˈeɪtʃˌhɪndʒ/ noun 1. a strap hinge having the form of an H with the joint in the crossbar.