\Il*lapse"\, v. i. [imp. & p. p. {Illapsed}; p. pr. &
vb. n. {Illapsing}.] [L. illapsus, p. p. of illabi; pref. il-
in + labi to fall, slide.]
To fall or glide; to pass; -- usually followed by into.
--Cheyne.

\Il*lapse"\, n. [L. illapsus. See {Illapse}, v. i.]
A gliding in; an immisson or entrance of one thing into
another; also, a sudden descent or attack. --Akenside.
      They sit silent . . . waiting for an illapse of the
      spirit.                                  --Jeffrey.