[hahrd-hak] 
| 1. | a woolly-leaved North American shrub, Spiraea tomentosa, of the rose family, having short, spikelike clusters of rose-colored flowers. |
| 2. | shrubby cinquefoil. |
| a small shrub, Potentilla fruticosa, of the rose family, native to the Northern temperate region, having pinnate leaves and numerous, showy, bright-yellow flowers. |
| hard·hack (härd'hāk') n. A woody plant (Spiraea tomentosa) of eastern North America, having leaves with rusty down on the undersides and spikelike clusters of small, rose-purple flowers. Also called steeplebush. |
