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crypto- hidden; secret.
cryptogam any of the plants, such as ferns and algae, that bear no flowers or seeds, reproducing instead by spores.
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.