halo-

1. a combining form meaning “salt,” used in the formation of compound words (halophyte); sometimes specialized as a combining form of halogen (halothane).

combining form

1. indicating salt or the seahalophyte
2. relating to or containing a halogenhalothane

before vowels hal-, word-forming element meaning “salt, sea,” from Greek hals (genitive halos) “a lump of salt, salt generally,” in Homer, “the sea,” from PIE *sal- “salt” (see salt (n.)).

pref.

1. Salt:halophilic.
2. Halogen:halide.