seminiferous

"Seminiferous" is a specialized adjective that means "bearing seed" in its older, root sense, but in present-day usage it is mainly used in anatomy and biology. Most often, it describes structures in the testes that are involved in making sperm. Because of that, the word appears far more often in textbooks, medical writing, and lab contexts than in everyday conversation.

The clearest example is seminiferous tubules. These are small, tightly coiled tubes inside the testes, and they are the place where sperm cells develop through the process of spermatogenesis. In other words, when this adjective appears in modern English, it usually points to the tissue or structures connected with sperm production, not to semen as a whole.

You may also come across the word in older or more general scientific writing with the broader sense of "seed-bearing." That sense explains its history, but it is much less common now than the anatomical one. Today, if someone uses "seminiferous," they are usually talking about male reproductive biology.

Because it is so technical, "seminiferous" is rarely used in metaphorical or creative ways. It is a precise scientific word, and its meaning depends heavily on context. In most modern cases, it means "related to sperm-producing structures," especially the seminiferous tubules shown in diagrams of the testes.