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Webster 1913 Edition

Sulphurous

Sul′phur-ous

,
Adj.
[L.
sulphurosus
,
sulfurosus
: cf. F.
sulfureux
.]
1.
Of or pertaining to sulphur.
2.
(Chem.)
(a)
Derived from, or containing, sulphur; specifically, designating those compounds in which the element has a lower valence as contrasted with the sulphuric compounds.
(b)
Having the characteristic odor of sulphur dioxide, or of hydrogen sulphide, or of other sulphur compounds.
Sulphurous acid
.
(a)
Sulphur dioxide. See under
Sulphur
.
[Obs.]
(b)
An acid,
H2SO3
, not known in the free state except as a solution of sulphur dioxide in water, but forming a well-known series of salts (the sulphites).
–
Sulphurous anhydride
(Chem.)
,
sulphur dioxide. See under
Sulphur
.

Webster 1828 Edition

Sulphurous

SUL'PHUROUS

,
Adj.
Like sulphur; containing sulphur; also, designating an acid formed by sulphur subsaturated with oxygen. This is called sulphurous acid.

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