hood (n.1) Look up hood at Dictionary.com
"covering," Old English hod "a hood, soft covering for the head" (usually extending over the back of the neck and often attached to a garment worn about the body), from Proto-Germanic *hodaz (cognates: Old Saxon, Old Frisian hod "hood," Middle Dutch hoet, Dutch hoed "hat," Old High German huot "helmet, hat," German Hut "hat," Old Frisian hode "guard, protection"), from PIE *kadh- "to cover" (see hat).

Modern spelling is early 1400s to indicate a "long" vowel, which is no longer pronounced as such. Used for hood-like things or animal parts from 17c. Meaning "Foldable or removable cover for a carriage to protect the occupants" is from 1826; meaning "sunshade of a baby-carriage" is by 1866. Meaning "hinged cover for an automobile engine" attested by 1905 (in U.K. generally called a bonnet). Little Red Riding Hood (1729) translates Charles Perrault's Petit Chaperon Rouge ("Contes du Temps Passé" 1697).
hood (n.2) Look up hood at Dictionary.com
"gangster," 1930, American English, shortened form of hoodlum.
hood (v.) Look up hood at Dictionary.com
c. 1200, "to put a hood on;" c. 1400, "to furnish with a hood," from hood (n.1). Related: Hooded; hooding.
hood (n.3) Look up hood at Dictionary.com
shortened form of neighborhood, by 1987, U.S. black slang.