Three, esp a three of playing cards
a suffix used in the formation of names of classes and orders: Crustacea. suffix denoting animals belonging to a class or order: Crustacea (class), Cetacea (order) word-forming element denoting orders and classes in zoology, from Latin -acea, neuter plural of -aceus “belonging to, of the nature of” (enlarged from adjectival suffix -ax, genitive -acis); neuter […]
a suffix used in the formation of names of families: Rosaceae. suffix denoting plants belonging to a family: Liliaceae, Ranunculaceae
a beta blocker, C 18 H 28 N 2 O 4 , used in the management of hypertension, angina pectoris, and cardiac arrhythmias.
acec American Consulting Engineers Council Area of Critical Environmental Concern