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The Collaborative International Dictionary of English v.0.48 (gcide)

Proteid \Pro"te*id\, n. [Gr. prw^tos first.] (Physiol. Chem.)
An older, imprecise term replaced by {{protein}}.

Note: Proteid was defined in the 1913 Webster as "One of a
class of amorphous nitrogenous principles, containing,
as a rule, a small amount of sulphur; an albuminoid, as
blood fibrin, casein of milk, etc. Proteids are present
in nearly all animal fluids and make up the greater
part of animal tissues and organs. They are also
important constituents of vegetable tissues. See 2d
Note under {Food}." -- {Pro"te*id}, a.

Syn: protein.
[1913 Webster PJC]

{Defensive proteid} (Physiol. Chem.), one of a class of
proteid substances, present in some animal tissues and
fluids, that make the body immune to certain infectious
diseases by destroying or rendering inactive the toxic
products of bacterial growth; -- this is an older term
replaced by more precise modern immunological concepts
such as {antibody} and {immunoglobulin}. [archaic]
[Webster 1913 Suppl. PJC]

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