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 (rĭ-to͞os′, -tyo͞os′)
adj. Botany
Having a rounded or obtuse apex with a central shallow notch: a retuse leaf.

[Latin retūsus, past participle of retundere, to beat back : re-, re- + tundere, to beat.]


(Botany) botany having a rounded apex and a central depression: retuse leaves.
[C18: from Latin retundere to make blunt, from re- + tundere to pound]


(rɪˈtus, -ˈtyus)

having an obtuse or rounded apex with a shallow notch, as leaves.
[1745–55; < Latin retūsus, past participle of retundere to make blunt =re- re- + tundere to beat, strike]
References in periodicals archive ?
(2007), plants from this cultivar show rusticity, indeterminate and prostrate growth, and retuse shaped leaves, with toothed leaf margin and discrete or absence hairiness.
Apex is acute to retuse. Margin is acutely serrate and umbrella-like, and floral leaves are opposite.
Leaves 2-3-foliolate, petioles 2.5-4 cm, petiolules 1 cm, both glabrous or slightly pubescent; leaflets 4.5-10 x 2.5-4 cm, concolorous, chartaceous, elliptical or oblong, apex obtuse, occasionally emarginate or retuse, margins entire, base rounded, venation penninerved, both surfaces glabrous or occasionally glabrescent, with few tector trichomes restricted to the midrib; tendrils simple.
Leaf apex shallowly retuse or bifid to 1/6-1/3 Fuscocephaloziopsis 4.
Petals white, 3-5 mm long, entire or retuse, oblong-linear.
Leaves distant, spreading, orbicular to ovate to subquadrate, apex rounded to retuse, margins entire, plane or dorsal margin slightly recurved; leaf bases hardly decurrent.
Lamina of larger leaves 16-26 cm long, 11-16 cm wide, broadly elliptical, broadly cuneate at base, rounded and apiculate or shallowly retuse at apex, adaxially glabrate at maturity except persistently loosely sericeous on midrib, abaxially densely and persistently appressed-tomentose with the hairs sessile or short-stalked and the crosspiece ca.
The leaves are generally characterized by acuminate apices (although they can be straight, convex, or retuse) and convex to rounded to slightly cordate bases.
Leaves widely obovate to widely depressed obovate, widely elliptic to oblate, widely ovate-circular, very widely ovate to widely depressed ovate, length/width ratios 1.2-0.8:1; apices commonly retuse, sometimes rounded; crenate-dentate; leaves when yet unfolded adaxially subglabrous, with minute glandular hairs throughout, pubescent and tomentose over teeth, and puberulent here and there on surface, pubescent from a few teeth apices, tufted on midvein and some secondary veins, when newly unfolded adaxially subglabrate except at apex and base; abaxially pubescent (rays planar), golden-tomentellous, later glabrate, glabrescent, gray trichomes, with primary to fifth order veins raised; white striae (wax?) along veins.
0.5 cm long, 0.7 mm wide, subreniform, retuse apex, occasionally slightly carinate and more frequently not carinate, lepidote), sepals 0.7 cm long, 0.4 cm wide, obovate, round and apiculate at the apex, strongly carinate, abaxially totally covered by a ferrugineous indument (vs.