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cryptogram a message written so as to conceal its meaning by the use of a cipher or code. [2 definitions]
cryptography the science or art of creating and decoding secret messages, esp. those employing ciphers and codes. [2 definitions]
cryptozoic (cap.) of or pertaining to Precambrian rock strata yielding few and very primitive fossils. [3 definitions]
crystal a naturally symmetrical or layered solid, such as diamond or quartz, with a regularly repeating three-dimensional atomic, ionic, or molecular structure. [7 definitions]
crystal detector a simple radio receiver made of a semiconducting crystal touched by a fine wire.
crystal gazing the practice of studying and interpreting images of future events, supposed to appear in a ball of polished glass or crystal.
crystalline of or made of crystal. [3 definitions]
crystalline lens a transparent, biconvex, lenslike body in the eye, between the iris and the vitreous humor, that focuses light on the retina.
crystallite a tiny crystal that typically forms as a material cools.
crystallize to convert into or cause to become crystals. [4 definitions]
crystallo- crystal.
crystallographic of, pertaining to, or involving the study of crystals.
crystallography the science of the formation, composition, and characteristics of crystals.
crystalloid a crystallizable substance that dissolves in liquid and passes easily through animal and vegetable membranes. [3 definitions]
crystal pickup a phonograph pickup that used a piezoelectric crystal.
crystal set an early form of radio receiver that used a crystal detector.
cry uncle to yield; give up.
cry wolf to give a false alarm.
Cs symbol of the chemical element cesium.
C-section abbreviation of "Caesarean section", a method of delivering an endangered fetus in which an incision is made through the walls of the mother's abdomen and uterus.
CST abbreviation of "Central Standard Time," the standard time used in the central region of the United States, six hours behind Greenwich time.