Definition of F1:

Used for convenience to denote the first filial generation, or the hybrids arising from a first cross, successive generations arising from this one being denoted by F2, F3, etc. P1 denotes the parents of the F1 generation, P2 the grandparents, and so on.

Usage examples for F1:

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In the Christian Church, the Communion table; in ancient times and in heathen countries, a raised place of earth or stone, on which to offer sacrifice or burn incense to the gods. ...