Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Botany Having a rounded or obtuse apex with a central shallow notch: A retuse leaf.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having a rounded apex with small central notch

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having the end rounded and slightly indented.

from The Century Dictionary and Cyclopedia

  • In botany, obtuse at the apex, with a broad and very shallow sinus reentering: as, a retuse leaf.
  • In zoology, ending in an obtuse sinus.

Etymologies

Latin retūsus, past participle of retundere, to beat back : re-, re- + tundere, to beat.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • 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.

    The Journals of John McDouall Stuart

  • The _first glume_ is cuneately obovate or obcordate, yellowish with red brown tips or dark brown with yellow tips, chartaceous below, membranous, hyaline and ciliate at the truncate, emarginate or retuse apex, 7 - to 9-nerved, the nerves abruptly ceasing towards the apex.

    A Handbook of Some South Indian Grasses

  • (rarely 5-nerved also); _palea_ is present, and it is hyaline, shorter than the glume, truncate or shallowly retuse, usually barren but occasionally with three stamens.

    A Handbook of Some South Indian Grasses

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