F-O

fecundity

Ability to produce offspring frequently and in large numbers.
In demography, the physiological ability to reproduce.

feromone

See pheromone.

fertility

Ability to conceive and to produce offspring: for litter-bearing species the number of offspring per litter is used as a measure of fertility.

Note	Reduced fertility is sometimes referred to as subfertility.

fetotoxicity

Toxicity to

fetus (often incorrectly foetus)

Young mammal within the uterus of the mother from the visible completion of characteristic organogenesis until birth.

Note	In humans, this period is usually defined as from the third month after fertilisation until birth (prior to this, the young mammal is referred to as an embryo).

fibrosis

Abnormal formation of fibrous tissue.

first-order process

Chemical reaction where the rate is directly proportional to the concentration of reactant.
Any process changing at a constant fractional rate.

first-pass effect

Biotransformation and, in some cases, elimination of a substance in the liver after absorption from the intestine and before it reaches the systemic circulation.

first-pass metabolism

Fundamental Toxicology

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