Rachides

Part of speech: noun

Definitions

1. A type of anatomical structure that encompasses the backbone or spinal column, including the vertebrae
2. Referring to a central ridge or axis, particularly in relation to the arrangement of bones or tissues in an organism
3. Denoting elements that are part of a larger framework, often related to the support and structure of an organism's body

Etymology: "Rachides" is simply the plural of "rachis," so the story belongs to the singular. The Ancient Greek word "rhákhis" meant "spine" or "ridge," and it was used for the backbone of a human or animal. Its sense was extended to any central stalk or axis, which is why botanists later applied it to the main stem of a feather or a leaf. Scientists in the early modern and later periods borrowed the Greek term through New Latin, where it appeared as "rhachis" or "rachis." English anatomists and naturalists then adopted it for specialized uses, such as the central axis of a feather, the stalk of a compound leaf or frond, or the spinal column itself. The plural "rachides" follows the Greek and Latin pattern of forming plurals in "-ides," a form still used for some technical terms in anatomy and botany.

Synonyms: rachis