h.d.

1. (in prescriptions) at bedtime.

1. heavy duty.

noun

1. HildaH.D., 1886–1961, U.S. poet.
2. James Harold,1896–1993, U.S. aviator and general.

noun

1. Hilda. known as H.D. 1886–1961, US imagist poet and novelist, living in Europe

abbr.

1. hora decubitus (before sleep, at bedtime)