— amnestic /am nes"tik/ , adj.
/am nee"zheuh/ , n.
loss of a large block of interrelated memories; complete or partial loss of memory caused by brain injury, shock, etc.
[ 1780-90; amnesía, var. of AMNESTÍA oblivion; perhaps learnedly formed from mne-, s. of mimnéskesthai to remember (cf. MNEMONIC) + -s- + -ia -IA. See AMNESTY ]