Triserial
Pronunciation : Tri*se"ri*al, Tri*se"ri*ate
Part of Speech : a
Etymology : [Pref. tri- + serial, seriate.] (Bot.)
Definition : Defn: Arranged in three vertical or spiral rows.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder