Designating a form of semaphore in which several pairs of pivoted movable arms are employed, arranged on several upright posts or on a single post. Now historical.
Origin
Early 19th century. From polygram + -atic.
Definition of polygrammatic in US English:
polygrammatic
adjectiveˌpɒlɪɡrəˈmatɪk
Designating a form of semaphore in which several pairs of pivoted movable arms are employed, arranged on several upright posts or on a single post. Now historical.