disintegrate

v. (-ting) 1 separate into component parts or fragments, break up. 2 colloq. Break down, esp. Mentally. 3 (of an atomic nucleus) emit particles or divide into smaller nuclei.  disintegration n.

v. t. To separate into integrant parts; to reduce to fragments or to powder; to break up, or cause to fall to pieces, as a rock, by blows of a hammer, frost, rain, and other mechanical or atmospheric influences.