IPA: rˈʌʃiz


  • (obsolete, zoology, anatomy) The spinal column, or the vertebrae of the spine.
  • (zoology) An anatomical shaft or axis in a marine invertebrate.
  • (ornithology) The central shaft of a feather.
  • (botany) The main shaft of either a compound leaf, head of grain, or fern frond.

Examples of "rachis" in Sentences

  • The size of the rachis is unknown.
  • The petiole and rachis have spines.
  • The structure of feather rachis keratin.
  • The rachis is yellow brown and almost smooth.
  • Leaves consist of a long petiole and a rachis.
  • The petiole connects the lead base with the rachis.
  • The rachis and stipe are light brown in colouration.
  • Inflorescences consist of a peduncle and a rachis long.
  • There is a joint where the leaflet is attached to the rachis.
  • The stipe and rachis of the frond are dark all along their length.
  • The spikelets are unilaterally biseriate on the rachis which is not jointed at the base.
  • Zoom out, and we see that feathers have a central shaft called the rachis with two vanes on either side.
  • The baby Anzu bird that Lugalbanda feeds and decorates is spotted with a multitude of tiny flowers and you can make out every barb, calamus, and rachis on the bird's feathered body.
  • But Archaeopteryx was very likely capable of powered fligh sic judging from its relatively massive furcula and the asymmetric rachis of its primary flight feathers Feduccia and Tordoff 1979; Olson and Feduccia 1979.
  • The “same mechanisms” that produce the main vane ALSO bring about: (1) the division of the posterior new barb locus, (2) the creation of a second rachis ridge, and (3) an entire second vane growing simultaneously from a single follicle.
  • Pinnately compound leaves have the leaflets arranged along the main or mid-vein (called a rachis in this case). odd pinnate: with a terminal leaflet, e.g. Fraxinus (ash). even pinnate: lacking a terminal leaflet, e.g. Swietenia (mahogany).
  • At last, quhen he wes cumin throw the vail that lyis to the gret eist fra the said castell, quhare now lyis the Canongait, the staik past throw the wod with sic noyis and din of rachis and bugillis, that all the bestis were rasit fra thair dennis.
  • Theoretically, humans should have influenced the changes from wild to domesticated rice mainly by continuous cultivation and selection of wild rice with mutated biological characteristics of more seeds, tough rachis, higher germination rates, etc.
  • Dodonaea microzyga, F.M. Somewhat viscid, almost glabrous; leaves with 1 to 2 pairs of small obovate-cuneate leaflets; in front rounded, or truncate, or retuse, or sometimes 3-toothed, flat at the margin; rachis dilated; fruit-bearing pedicels solitary; capsules 3 to 4-celled; valves cymbeo-semiorbicular, all around broadly winged; the wing rounded-blunt on both extremities; dissepiments persistent with the columella.

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