palinode		a poem in which the poet retracts something said in an earlier poem.
pseudoscope		an optical device for producing a depth-reversed image.
cassation		cancellation or reversal; a type of 18th-century instrumental suite.
tain		tin foil used to silver mirrors.
librate		to balance; to oscillate from side to side.
equivoque		an ambiguous expression; a play on words; double meaning.
squeg		(of an electronic circuit) to oscillate between zero and a certain maximum value.
diadochokinesia		the (normal) ability to execute fast alternating movement.