1) Anatoxin 2) Antigen 3) Bacterial toxin 1) Anatoxin 
A toxoid is a bacterial toxin (usually an exotoxin) whose toxicity has been inactivated or suppressed either by chemical (formalin) or heat treatment, while other properties, typically immunogenicity, are maintained. Thus, when used during vaccination, an immune response is mounted and immunological memory is formed against the molecular markers o...
a bacterial toxin that has been weakened.
• (n.) An altered form of a toxin, possessing little or no toxic power.
bacterial poison (toxin) that is no longer active but retains the property of combining with or stimulating the formation of antibodies. In many ... [3 related articles]
<pharmacology> Nontoxic derivative of a bacterial exotoxin produced by formaldehyde or other chemical treatment: useful as a vaccine because it retains most antigenic properties of the toxin. ... (12 Jan 1998) ... 
(tok´soid) a toxin treated by heat or chemical agent to destroy its deleterious properties without destroying its ability to combine with or stimulate the formation of antitoxin. diphtheria toxoid a sterile preparation of formaldehyde-treated products of the growth of Corynebacteriu...
A nontoxic derivative of a toxin used as an immunogen for the induction of antibodies capable of cross-reacting with the toxin.
A toxin modified so that it is no longer toxic but is still able to induce antibody formation.Non-toxic derivative of a bacterial exotoxin produced by formaldehyde or other chemical treatment: useful as a vaccine because it retains most antigenic properties of the toxin.
Tox'oid noun [ Tox in + - oid .] (Physiol. Chem.) An altered form of a toxin, possessing little or no toxic power. 
Type: Term Pronunciation: tok′soyd Definitions: 1. A toxin that has been treated (commonly with formaldehyde) so as to destroy its toxic property but retain its antigenicity, its capability of stimulating the production of antitoxin antibodies and thus of producing an active immunity. Synonyms: anatoxin See: For specific toxoids, see entries ...
A chemically modified form of a toxin that is used in a vaccine to stimulate an immune response.
Inactivated or killed toxin (poison) used in vaccine production.
An immunizing agent against toxins produced by bacteria. Most often form of immunity to tetanus.
Inactivated toxin from a particular bacteria that is injected and generates antibodys to the toxin.
A vaccine made from a toxin (poison) that has been made harmless but that elicits an immune response against the toxin.