noun, noun which may take the genitive case particle 'no'
testicle; testis
Anatomical term; used in medical or biological contexts. In everyday conversation, 睾丸 (こうがん) is more common.
The testis is part of the male reproductive organ.
It is important to detect testicular abnormalities early.
From 精 (せい, 'essence, sperm') and 巣 (そう, 'nest'), referring to the organ that produces sperm.