*Abnormal. Contrary to the general rule.
*Aborted. An organ is said to be aborted when its development has been arrested at a very early stage.
Aërate (Zoöl.). To subject to the influence of the air by the natural organs of respiration; to arterialize; especially used of animals not having lungs.
Agnostic (a.). Professing ignorance; involving no dogmatic assertion; leaving a question or problem still in doubt; pertaining to or involving agnosticism.
Agnostic (n.). One who professes ignorance, or refrains from dogmatic assertion; one who supports agnosticism, neither affirming nor denying the existence of a personal Deity.
Agnosticism. That doctrine which, professing ignorance, neither asserts nor denies; specifically, in theology, the doctrine that the existence of a personal Deity can be neither asserted nor denied, neither proved nor disproved, because of the necessary limits of the human mind (as sometimes charged upon Hamilton and Mansel), or because of the insufficiency of the evidence furnished by psychical and physical data, to warrant a positive conclusion (as taught by the school of Herbert Spencer); opposed alike to dogmatic skepticism and to dogmatic theism.
Allantois, Allantoid. A thin membrane, situated between the chorion and amnion, and forming one of the membranes which invest the fœtus.
*Analogy. That resemblance of structures which depends upon similarity of function, as in the wings of insects and birds. Such structures are said to be analogous, and to be analogues of each other.
Anthropomorphism. The representation of the Deity under a human form, or with human attributes.