‖ arenaria|ærɪˈnɛərɪə| [L., fem. of arēnārius: see next.] The Sandwort; a genus of small herbs (family Caryophyllaceæ) allied to chickweed. a1806C. Smith Flora's Horol. ix, Among the loose and arid sands The humble arenaria creeps.1881Garden 313 Other Arenarias in cultivation.