TETRAGRAPH
Meaning of TETRAGRAPH in English
ˈte.trəˌgraf noun
Etymology: tetra- + -graph
: a cluster of four successive letters in cryptography
• tet·ra·graph·ic | ̷ ̷ ̷ ̷|grafik adjective
Webster's New International English Dictionary.
Новый международный словарь английского языка Webster.
2012