Definition of hair grass in US English:

hair grass

noun

  • A slender-stemmed grass of temperate and cool regions.

    Deschampsia, Aira, and other genera, family Gramineae

    • ‘Tufted hair grass is clump-forming, cool season grass which is often grown as an ornamental.’
    • ‘Marshall suggests that climatic factors restrict the distribution of the grey hair grass to the south of this isotherm because the grass cannot germinate or flower in areas affected by low temperatures.’
    • ‘Crested hair grass has no special soil requirements and is therefore not sensitive to aridity.’
    • ‘Tufted hair grass is an excellent specimen plant in a conventional or water garden.’
    • ‘High above tree line, this renegade group had survived nicely on a diet of heather, trailing azalea, tufted hair grass, and the leaves and stems of cowberries and blueberries.’

Pronunciation

hair grass

/ˈher ˌɡras/