hd

1. high-definition; high definition: channels that broadcast in HD; HD video; HD DVDs; an HD display on my new tablet.
2. Computers. high-density(def 2).

1. hand.
2. head.

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.

abbreviation for

1. hand
2. head

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)