-ˌfizəˈdā(ˌ)lēz noun plural
Usage: capitalized
Etymology: New Latin, probably irregular from Dinophysis, genus belonging to the order Dinophysidales (from dino- + Greek physis nature) + -ales — more at physic
: an order of algae (class Dinophyceae) having the cell wall made up of a definite number of plates arranged in a fixed pattern and vertically divided into two similar halves or valves — compare desmokontae