Horizontal downward Synonyms

Definitions for Horizontal

(noun) something that is oriented horizontally
(adjective) parallel to or in the plane of the horizon or a base line

HD abbreviation

HD is an abbreviation for Horizontal Downward

What does HD stand for?

HD stands for "Horizontal Downward"

Definitions for Downward

(adjective) directed down
(adverb) toward or in a lower position
(adjective) extending or moving from a higher to a lower place