| embryology | <study> The study of the embryo and its development from a one-celled zygote (fertilized ovum) to the establishment of form and shape (at which point, if it is an animal, it becomes a foetus). A subfield of developmental biology. (09 Oct 1997) |
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| causal | Pertaining to a cause, directed against a cause. (18 Nov 1997) |
| causal additivity | The relationship between two or more causal components such that their combined effect is the algebraic sum of their individual effects. (05 Mar 2000) |
| causal independence | The state of systems that share no causes or effects. (05 Mar 2000) |
| causal treatment | Treatment aimed at reversing the causal factor in a disease. (05 Mar 2000) |