Parella \Pa*rel"la\, Parelle \Pa`relle\, n. [Cf. F. parelle.]
(Bot.)
(a) A name for two kinds of dock ({Rumex Patientia} and
{Rumex Hydrolapathum}).
(b) A kind of lichen ({Lecanora parella}) once used in dyeing
and in the preparation of litmus.
[1913 Webster]