herm. is a botanical/zoological abbreviation for hermaphrodite, a sexually reproducing organism that produces both male and female gametes.

• Avise JC (2011-03-18). Hermaphroditism: A Primer on the Biology, Ecology, and Evolution of Dual Sexuality. Columbia University Press. pp. 1–7. ISBN 978-0-231-52715-6.
• https://en.wikipedia.org/wiki/Herm_(disambiguation)

Herm. following the name of a Christian saint denotes that the saint was a hermit

• https://en.wikipedia.org/wiki/Herm_(disambiguation)