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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Distended or swollen beyond the natural size; bloated; as, a turgid stream of water; turgid veins; inflated; bombastic; pompous; as, a turgid style in writing. ...