Singular: testis
Plural: testes
Testes is the plural form of testis referring to a pair of male reproductive organs.
"Testes" is the plural form of "testis."
Testes is the plural form of testis, which means testicle.
Testis is the medical anatomical term. Testis/testicles are the same thing. Testis/testicles are responsible for the production of male hormones and sperm. Testis and testicles are NOT the same thing. "Testis" is the singular form and "testes" is its plural. "Testicles" is the plural of "testicle." I'm not as certain of this, but I've come to believe that a testicle is an abnormally small testis.
The singular word of testes is testis.
The testis (plural testes) or testicle is the male sex gland.
A testis (plural testes) is a male gonad.
There is no plural form. Do and Do not are verbs
The plural form of him, her, or it is them. (objective pronouns)
Bridges is the plural form of bridge.
The plural form of "is" is "are."
The plural form of "was" is "were."