رجْلَي
1.
feminine of رَجْلَانُ: see رَاجِلٌ near the end of the paragraph.
2.
حَرَّةٌ رَجْلَي and
رَجْلَاءُ
A [stony tract such as is called] حَرَّة
that is rough [or rugged], in which one goes on foot: or level, but abounding with stones: (K:) or rough and difficult, in which one cannot go except on foot: (TA:) or the latter signifies level, but abounding with stones, in which it is difficult to go along: (S:) or hard and rough, which horses and camels cannot traverse, and none can but a man on foot: (AHeyth, TA:) or that impedes the feet by its difficulty. (Er-Rághib, TA.)
3.
رَجْلَي is also a plural of رَجْلَانُ: (S:) [and apparently of رَجِيلٌ also.]