Midrib

Part of speech: noun

Pronunciation: /ˈmɪdrɪb/

Definitions

1. The central vein of a leaf that provides structural support and transports nutrients
2. A prominent structure within a leaf that aids in the distribution of water and minerals while maintaining leaf shape
3. The main vascular tissue running through a leaf, crucial for its nourishment and stability

Etymology: "Midrib" is a plain compound: "mid-", meaning middle, joined to "rib," the familiar word for the bone in the chest. The "mid" element traces back through Old English "midd" and Proto-Germanic "midjaz" to a much older Indo-European root meaning "middle," and it has been in English since the Old English period. The "rib" element is the same word that names the curved bones of the body, and it has long been applied to any slender raised structure that supports or stiffens something else. The joined sense is literal and easy to picture. A leaf's midrib is the central vein running from the base to the tip, the thick ridge you can see on the underside of a leaf, and it works as a spine that carries water and minerals outward while holding the blade flat. The word therefore describes the middle rib of a leaf, with no metaphor needed beyond the bone comparison.

Synonyms: vein, spine, stem, axis, central vein