In plants, a rachis is the main axis of a compound structure. It can be the main stem of a compound leaf, such as in Acacia or ferns, or the main, flower-bearing portion of an …

The meaning of RACHIS is an axial structure. an axial structure: such as; the elongated axis of an inflorescence; an extension of the petiole of a compound leaf that bears the leaflets… See the …

Fruit.—Fleshy, coalescent and sunk in the rachis. Rachis definition: . See examples of RACHIS used in a sentence.

3 meanings: 1. botany the main axis or stem of an inflorescence or compound leaf 2. ornithology the shaft of a feather, esp the.... Click for more definitions.

The main stem of an elongated inflorescence, as in a grass. The principal axis of an inflorescence or of a compound leaf. Spinal column. The shaft of a feather, esp. that part bearing the barbs. …

RACHIS definition: 1. the central stem of a leaf or flower spike that has several parts: 2. the spine (= line of…. Learn more.

Jan 2, 2025 · rachis (plural rachises or rachides) (obsolete, zoology, anatomy) The spinal column, or the vertebrae of the spine. [17th–19th c.] An anatomical shaft or axis in a marine …

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1. a thornlike process or projection; called also acantha and spina. 2. the rigid bony structure in the midline of the back, composed of the vertebrae; called also backbone, spinal column, and …

What does the noun rachis mean? There are seven meanings listed in OED's entry for the noun rachis , one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and …