hood (n.1) Look up hood at Dictionary.com
"covering," Old English hod "hood," 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- "cover" (see hat).

Modern spelling is early 1400s to indicate a "long" vowel, which is no longer pronounced as such. Meaning "removable cover for an automobile engine" attested by 1905. 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
"to put a hood on," c.1200, 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.