A Quenya word meaning “a cast shadow” appearing in two forms, hala and (archaic) †ixal, both cognates to S. esgal and derived from the root √SKAL “cover, veil, cloak, conceal” (PE17/184). The form hala is the normal development from primitive ✶skalā where the initial *sk* eventually became *h*, whereas ixal shows a vowel *i* developing before syllabic *ṣ* and then the surviving *sk* undergoing metathesis to *ks* (*x*).
Neo-Quenya: Given that primitive ✶skalā is actually “the action or effect of overshadowing”, I think hala can mean both “(cast) shadow” and “✱shade” as in a shaded region beneath a screen of leaves or something similar. For the screen itself I’d use fanwa.
hala (1) noun "(small) fish" (KHAL1, SKAL2, VT45:20)