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having three angles or corners.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

tri·an·gu·lar mus·cle

1. a three-sided muscle; Synonym(s): musculus triangularis (1) [TA]
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
Linyphia triangularis (Clerck, 1757) Y (part or all of [web.sup.2];
L: left; R: right; Orb: orbitalis; Tri: triangularis; Operc: opercularis; PreC: precentral; SMA: supplementary motor area.
Caption: Figure 3: Regression of group asymmetry indices for MCI nonconverters and converters in five selected ROIs, including the banks of the superior temporal sulcus (cyan), caudal middle frontal gyrus (red), inferior parietal lobule (blue), pars triangularis (green), entorhinal cortex (yellow), and parahippocampal gyrus (pink).
Cortical cluster ROIs Motor, premotor cortex Caudal middle frontal Precentral Frontal pole Dorsal lateral prefrontal cortex (DLPFC) Rostral middle frontal Pars triangularis Pars orbitalis Cingulate motor area (CMA) Rostral anterior cingulate Posterior cingulate Supplementary motor area (SMA) Paracentral Superior frontal Parietal lobe Postcentral Supramarginal Superior parietal Inferior parietal Subcortical Thalamus proper Caudate Putamen Pallidum Accumbens area Brainstem Brainstem Table 3: Identified connections with significant group-wise differences.
Johnson 17.7 2.2 Staurastrum leptacanthum Nordstedt -- 25.6 Staurastrum pseudosebaldi Wille -- 2.2 Staurastrum rotula Nordstedt 15.6 36.7 Staurastrum tetracerum Ralfs -- 2.2 Staurastrum triangularis (Lagerheim) Teiling 1.0 -- Staurastrum sp.
Para el caso del hipogloso, la primera neurona corresponde a la neurona motora superior de naturaleza glutamatergica, localizada en la corteza cerebral, principalmente en la capa piramidal interna de las circunvoluciones precentral y frontal inferior (pars triangularis y opercularis), correspondientes a las areas motora primaria o 4 y de Broca o 44, 45, respectivamente.
Yours, Ernest March Bishop's Stortford, Herts Hi Ernest, The only plant I can think of is Oxalis triangularis, which is an indoor plant sometimes known as False Shamrock.