Hal"o*gen (hl"*jn), n. [Gr. "a`ls, "alo`s, salt + -gen: cf. F.
halogËne.] (Chem.) An electro-negative element or radical, which, by
combination with a metal, forms a haloid salt; especially, chlorine,
bromine, and iodine; sometimes, also, fluorine and cyanogen. See
Chlorine family, under Chlorine.
Ha*log"e*nous (h*lj"*ns), a. Of the nature of a halogen.
Ha"loid (h"loid or hl"oid), a. [Gr. "a`ls, "alo`s salt + -oid: cf. F.
haloÔde.] (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.
Hal"o*man`cy (hl"*mn`s), n. See Alomancy.
Ha*lom"e*ter (h*lm"*tr), n. [Gr. "a`ls, "alo`s, salt + -meter.] An
instrument for measuring the forms and angles of salts and crystals; a
goniometer.
||Ha*lo"nes (h*l"nz), n. pl. [NL., fr. Gr. "a`lwn, "a`lwnos, a halo.]
||(Biol.) Alternating transparent and opaque white rings which are seen
||outside the blastoderm, on the surface of the developing egg of the
||hen and other birds.
Hal"o*phyte (hl"*ft), n. [Gr. "a`ls, "alo`s, salt + fyto`n a plant.]
(Bot.) A plant found growing in salt marshes, or in the sea.
Ha"lo*scope (h"l*skp), n. [Halo + -scope.] An instrument for exhibition
or illustration of the phenomena of halos, parhelia, and the like.
Hal*o*tri"chite (hl**tr"kt), n. [Gr. "a`ls sea + qri`x, tricho`s,
hair.] (Min.) An iron alum occurring in silky fibrous aggregates of a
yellowish white color.
Ha*lox"y*line, n. [Gr. "a`ls, "alo`s, salt + xy`lon wood.] An explosive
mixture, consisting of sawdust, charcoal, niter, and ferrocyanide of
potassium, used as a substitute for gunpowder.