Semen (also known as Seminal Plasma, Plasma, Seminal): The thick, yellowish-white, viscid fluid secretion of male reproductive organs discharged upon ejaculation. In addition to reproductive organ secretions, it contains SPERMATOZOA and their nutrient plasma.

NIH MeSH · D012661Anatomy

Semen

Also known asSeminal Plasma · Plasma, Seminal

Definition

The thick, yellowish-white, viscid fluid secretion of male reproductive organs discharged upon ejaculation. In addition to reproductive organ secretions, it contains SPERMATOZOA and their nutrient plasma.

MeSH classification

  • A12.200.732

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Related concepts

Bile

An emulsifying agent produced in the LIVER and secreted into the DUODENUM. Its composition includes BILE ACIDS AND SALTS; CHOLESTEROL; and E…

Bodily Secretions

Endogenous substances produced through the activity of intact cells of glands, tissues, or organs.

Common questions about Semen

What does Semen mean in medicine?
The thick, yellowish-white, viscid fluid secretion of male reproductive organs discharged upon ejaculation. In addition to reproductive organ secretions, it contains SPERMATOZOA and their nutrient plasma. This definition is taken from the National Library of Medicine's MeSH (Medical Subject Headings) 2026 release, which is the standard vocabulary used to index PubMed and most medical literature.
Is Semen known by any other names?
Yes. Semen is also referred to as Seminal Plasma, Plasma, Seminal in different clinical, research and patient-facing contexts. The MeSH descriptor groups all of these synonyms under a single canonical concept so research and records stay consistent.
Where does Semen sit in the medical classification?
Semen falls under the broader medical category "Anatomy" in the MeSH hierarchy (tree numbers: A12.200.732). Browsing the related concepts on this page takes you to neighbouring topics in the same branch of medicine.
Where can I get a plain-language explanation of Semen?
For a plain-language explanation of Semen - including symptoms, treatments and what it means for an Indian patient - ask GoDavaii's Health AI. It works in 22+ Indian languages, is free and needs no signup. Tap "Ask GoDavaii AI about Semen" above.

Source: NIH MeSH 2026 (D012661) — National Library of Medicine, public domain. View official MeSH record ↗