n Bot. Family of dicotyledonous plants with usually simple, alternate leaves that have sheathing petioles, flowers arranged in umbel, and fruits composed of 2 achenes, such as celery, fennel, carrot, and parsley.
The species within this family are distributed in 300 to 400 genera.
Type genus: Apium.
From modern Latin Apiaceae; from Apium, «celery»; and the Latin suffix -aceae, «-aceous».