GNU Collaborative International Dictionary of English

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1.       
   Haloid (hāˈloid or hălˈoid), a. [Gr. ἄλς, ἁλός salt + -oid: cf. F. haloïde.] (Chem.) Resembling salt; -- said of certain binary compounds consisting of a metal united to a negative element or radical, and now chiefly applied to the chlorides, bromides, iodides, and sometimes also to the fluorides and cyanides. -- n. A haloid substance.
   
   [1913 Webster]