Ochrea

Part of speech: noun

Definitions

1. A botanical term for a protective sheath surrounding young growths in plants that aids in their development and stability
2. Referring to a membranous or tubular covering that safeguards and supports new plant shoots as they emerge
3. A specialized structure in certain plants that functions as a protective sheath for emerging shoots and contributes to their growth and resilience

Etymology: "Ochrea" comes straight from Latin, where "ochrea" meant a greave, the armour that protected the shin. The botanical sense is a loan of that image: the sheath wrapped around a young stem or shoot is shaped like a protective covering for the leg, which is why botanists borrowed the word for it. The term is a technical coinage in the sense that it moved from a military object to a plant part by analogy, rather than being used by ancient writers about plants. Its use in English is confined to botany, where it names the sheath that encloses young growth and supports it as it develops.