acanthus
- n any plant of the genus Acanthus having large spiny leaves and spikes or white or purplish flowers; native to Mediterranean region but widely cultivated
acanthus family
- n widely distributed herbs and shrubs and trees; sometimes placed in the order Scrophulariales
acanthus mollis
- n widely cultivated southern European acanthus with whitish purple-veined flowers
acapnia
- n a state in which the level of carbon dioxide in the blood is lower than normal; can result from deep or rapid breathing