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trigonal - definition and meaning
Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
from The Century Dictionary.
entomology , triangular in cross-section; having three long edges; trihedral; prismatic: as, trigonal antennæ; trigonal joints. botany , same as trigonous . anatomy , noting a triangular space at the base of the bladder. See trigonum .noun anatomy , the triangular space at the base of the bladder; the trigonum.
from the GNU version of the Collaborative International Dictionary of English.
adjective
from Wiktionary , Creative Commons Attribution/Share-Alike License.
adjective symmetrically triangular
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[Earlier, relating to a trigon or triplicity, relating to three angles : Latin trigōnum , triangle; see trigon + -al.]
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Examples
Both have identical major ion chemistry CaCO3 but different structures: calcite is trigonal whilst aragonite is orthorhombic.
Thompson: "Remarkably Similar" « Climate Audit 2006
-- Here there is rotation of one portion with respect to the other through 180° about the principal (trigonal ) axis, which is perpendicular to the plane c (111); or the same result may be obtained by reflection across this plane.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
Horns very large, depressed and sub-trigonal at the base, attached to the highest line of the frontals, inclining upwards and backwards, conical towards the tip and bending upwards; muffle large, square.
Natural History of the Mammalia of India and Ceylon Robert Armitage Sterndale 1870
The horns are trigonal , laterally compressed and knotted on the upper edge.
Natural History of the Mammalia of India and Ceylon Robert Armitage Sterndale 1870
[VENUS LATILIRATA] Shell sub-trigonal , thick and ponderous for its size; ribs fine, concentric, and very thick; irregularly stirate, crenulate upon the lower margin; umbo slightly flattened.
Report of the North-Carolina Geological Survey. Agriculture of the Eastern Counties: Together with Descriptions of the Fossils of the Marl Beds 1858
"The general form is trigonal , or wedge form, valves closed, front produced, posterior short; margins usually crenulated; hinge teeth 2 -- 2; laterals 1 -- 1 in each valve; pallial sinus deep."
Report of the North-Carolina Geological Survey. Agriculture of the Eastern Counties: Together with Descriptions of the Fossils of the Marl Beds 1858
Moreover, some evidence suggests a cardiomyogenic differentiation capacity of MPCs, revealing the capacity to generate quadri - or trigonal cells positive for α-actinin and troponin I (data not shown).
PLoS ONE Alerts: New Articles Simone Pacini et al. 2010
Pure corundum is a colorless, trigonal crystal with a hardness between that of emerald and diamond.
unknown title 2009
The newest - and possibly the best - blue pigment in world history was born, due to manganese ions being structured in an unusual "trigonal bipyramidal coordination" in the presence of extreme heat.
innovations-report 2009
Hornberg A, Tunemalm AK, Ekstrom F (2007) Crystal structures of acetylcholinesterase in complex with organophosphorus compounds suggest that the acyl pocket modulates the aging reaction by precluding the formation of the trigonal bipyramidal transition state.
PLoS ONE Alerts: New Articles Yuan-Ping Pang et al. 2009
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