tomentum

noun, plural to·men·ta [tuh–men-tuh] /təˈmɛn tə/. Botany, Entomology.

1. pubescence consisting of longish, soft, entangled hairs pressed close to the surface.

noun plural -ta (-tə)

1. a feltlike covering of downy hairs on leaves and other plant parts
2. a network of minute blood vessels occurring in the human brain between the pia mater and cerebral cortex

n. pl. to•men•ta (-tə)

1. A network of extremely small blood vessels passing between the pia mater and the cerebral cortex.