Definitions

1. noun

The small, usually pointed, hair or bristle at the base of a leaf, often used as a point of attachment for climbing plants, or the small, pointed part of a seedling where the primary leaves meet.

“The plumula of the seedling was where the first leaves met, marking the beginning of its growth.”

2. anatomy

The small, pointed structure at the base of a tooth, from which the root of the tooth grows.

“The dentist examined the plumula of the tooth before performing the extraction.”