blackbird
noun
1
a black person. A US mass murderer believed that among the secret messages hidden in the music of the Beatles were references to a coming black uprising in the song 'Blackbird' US, 1832.
2
an unmarked military aircraft, such as a C-123 or C-130. Used by the Studies and Observations Group (SOG) in Vietnam, the highly secret, elite, unconventional warfare component of the US military presence in Southeast Asia US, 1991.
3
an amphetamine capsule US, 1972.
4
LSD UK, 2003