Hair grass

1.

(Bot.) A grass with very slender leaves or branches; as the Agrostis scabra, and several species of Aira or Deschampsia.

Noun

1.

hair grass - fine-leaved aquatic spike rush; popular as aerator for aquariums Synonyms: Eleocharis acicularis, needle rush, needle spike rush, slender spike rush

Eleocharis acicularis, needle rush, needle spike rush, slender spike rush, spike rush