Of the nature of, consisting of, or in the form of an acrostic.
Origin
Early 17th century; earliest use found in Thomas Gataker (1574–1654), Church of England clergyman and scholar. From acrostic or its etymon post-classical Latin acrostichis + -al.
Definition of acrostical in US English:
acrostical
adjectiveəˈkrɒstɪkl
Of the nature of, consisting of, or in the form of an acrostic.
Origin
Early 17th century; earliest use found in Thomas Gataker (1574–1654), Church of England clergyman and scholar. From acrostic or its etymon post-classical Latin acrostichis + -al.