| 释义 |
isogen|ˈaɪsədʒɛn|
[f. iso- + Gr. γένος offspring.]
A line or curve in a diagram showing the various combination of the ages of the parents which are associated with the same average birthrate.
1894F. Galton in Proc. Royal Soc. 12 Jan., In natality tables, the ages of the father and mother take the place of the latitudes and longitudes in weather charts, and lines of similar birth-rates, or, as I would call them, ‘isogens’, take the place of isobars. |