The Collaborative International Dictionary of English v.0.48:

Charybdis \Cha*ryb"dis\, n. [L., Gr. cha`rybdis.]
   A dangerous whirlpool on the coast of Sicily opposite Scylla
   on the Italian coast. It is personified as a female monster.
   See Scylla.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Charybdis
    n 1: (Greek mythology) a ship-devouring whirlpool lying on the
         other side of a narrow strait from Scylla

The Free On-line Dictionary of Computing (30 December 2018):

CHARYBDIS

    A Lisp program to display
   mathematical expressions.  It is related to MATHLAB.

   [Sammet 1969, p. 522].

   (1994-11-15)