Definition of lady's cushion in US English:

lady's cushion

(also ladies cushion, ladies' cushion)

noun

rare
  • 1English regional (chiefly south-western). Thrift, Armeria maritima.

  • 2English regional. Any of several saxifrages (family Saxifragaceae); especially mossy saxifrage, Saxifraga hypnoides.

Origin

Mid 17th century; earliest use found in Robert Lovell (?1630–1690), naturalist. From the genitive of lady + cushion, although the first element is sometimes apprehended as plural; so called on account of the plants' habit of growing in thick tufts or clumps.

Pronunciation

lady's cushion

/ˌleɪdɪz ˈkʊʃn/