noun
fertility; fecundity
Medical term referring to the ability to conceive or reproduce. Used in clinical contexts.
妊孕能の低下は不妊の原因の一つです。
Decreased fertility is one cause of infertility.
この治療は妊孕能を温存することを目的としています。
This treatment aims to preserve fertility.
生殖能力 is a broader term for reproductive ability in general, not limited to conception.
Compound of 妊 (にん, 'pregnancy'), 孕 (よう, 'conceive'), and 能 (のう, 'ability'). The exact derivation is uncertain; it is a modern medical coinage.