a secret or disguised way of writing; a code

he wrote cryptic notes in a cipher

the information may be given in cipher

a zero; a figure 0

a monogram

a pair of rock crystal goblets engraved with the cipher of Peter the Great

put (a message) into secret writing; encode

he left two, as yet uncracked, ciphered messages for posthumous decoding

do arithmetic

a continuous sounding of an organ pipe, caused by a mechanical defect

(of an organ pipe) sound continuously