Having undergone fertilization; describes an egg that has been penetrated by sperm or soil that has been enriched with nutrients. In biology, refers to the successful union of male and female gametes.
From French 'fertiliser', from Latin 'fertilis' (bearing, productive), from 'ferre' (to bear, carry). The biological sense developed in the 17th century, while the agricultural meaning of enriching soil came slightly later as scientific understanding of plant nutrition advanced.
The word's dual meaning in biology and agriculture reflects humanity's growing understanding that both plant and animal reproduction follow similar principles of combining essential elements. The discovery that plants need specific nutrients from soil paralleled discoveries about sexual reproduction, both representing major advances in scientific thinking.
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