trophonema means any of several glandular villi of the uterus of viviparous sharks which supply nutrient to the embryos. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From tropho- + -nema (“filament”).
noun
- Any of several glandular villi of the uterus of viviparous sharks which supply nutrient to the embryos“The trophonema consists of 50–60 trophocytes that maintain contact with <1% of the oocyte surface and forms a circular, bowel-shaped depression on the luminal surface of the gastrodermis as they sink into the mesoglea with the oocyte.”