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 inflorescence above a supporting peduncle.

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 full definition

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

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. (zoology, anatomy) The spine or the vertebrae of the spine. From New Latin, from Ancient Greek ῥάχις (rhakhis, “spine, ridge" ).

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.

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

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