heath / hē[unvoicedth]/ • n. 1. an area of open uncultivated land, esp. in Britain, with characteristic vegetation of heather, gorse, and coarse grasses. ∎ Ecol. vegetation dominated by dwarf shrubs of the heath family: [as adj.] heath vegetation. 2. a dwarf shrub with small leathery leaves and small pink or purple bell-shaped flowers, characteristic of heathland and moorland. • Erica and related genera, family Ericaceae (the heath family): many species, including the common European cross-leaved heath (E. tetralix).DERIVATIVES: heath·y adj.