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 (trī-kwē′trəm, -kwĕt′rəm)
n. pl. tri·que·tra (-kwē′trə, -kwĕt′rə)
A bone of the wrist in the proximal row of carpal bones.

[Latin, neuter of triquetrus, three-cornered; see triquetrous.]

tri·que′tral (-trəl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Anatomy) anatomy a wrist bone. Also called: triquetral bone
2. (Astronomy) an ancient astronomical instrument used to determine the altitude of heavenly bodies
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
SA HEM ROS Hymenasplenium triquetrum (N.Murak SA HEM ROS & R.C.Moran) Regalado & Prada Athyriaceae Deparia petersenii (Kunze) M.Kato IN HEM ROS Diplazium cristatum (Desr.) Alston TA HEM ROS Diplazium herbaceum Fee EBN HEM ROS Blechnaceae Blechnum auriculatum Cav.
Noting this, the consulting surgeon ordered an X-ray which revealed that the patient had a missed perilunate dislocation with a fracture of the triquetrum and a comminuted impaction fracture of the scaphoid facet (Figure 1).
Mao et al., "Four new prenylated isoflavonoids in Tadehagi triquetrum," Journal of Agricultural and Food Chemistry, vol.
(12) Because of the extension force from the triquetrum transmitted through the lunotriquetral ligament, the lunate extends the proximal pole through the scapholunate ligament and the distal pole fexes producing a "humpback deformity." Volar flexion of the scaphoid and dorsiflexion of the lunate can result in dorsal intercalated segmental instability (DISI) deformity.
The MH extended from the ulnar styloid to the dorsal edge of the triquetrum, hamate, and the base of the fifth metacarpal.
Focus of the study was the following eight wrist bones: capitate, scaphoid, lunate, hamate, pisiform, trapezoid, triquetrum, and trapezium.
For itch induction, two surface electrodes were attached to the center of the lateral side of the wrist, a disk electrode (0 1cm, VCM Medical, The Netherlands) 1.5 cm proximal to the triquetrum, and a reference electrode (0 2 cm, VCM Medical, the Netherlands) 2cm proximal [37, 38, 42].
Extracts of red algae present several biological activities, such as antifungal (Symphyocladia latiuscula and Laurencia papillosa) (Xiuli, Liyuan, Junhai, Lijie, & Fuhang, 2014, Alarif, Al-Lihaibi, Abdel-Lateff, & Ayyad, 2011); antioxidant (Neorhodomela aculeate and Rhodomela confervoides) (Lim et al., 2006, Li, Li, Gloer, & Wang, 2011); antitumor-antimicrobial (Laurencia obtusa) (Alarif, Al-Lihaibi, Ayyad, Abdel-Rhman, & Badria., 2012); leishmanicidal (Bostrychia tenella) (Felicio, Albuquerque, Young, Yokoya, & Debonsi, 2010) and anti-inflammatory/antinociceptive (Bryothamnion triquetrum) (Cavalcante-Silva et al., 2012).
The lunate was identified from the proximal aspect between the scaphoid laterally and the triquetrum medially and incisions made to free it.
The species identified were Amphiroa fragilissima, Acanthophora spicifera, Bryothamnion triquetrum, Caulerpa racemosa, Ceramium nitens, Chaetomorpha crassa, Cladophora vagabunda, Dasya antillarum, Dictyota caribaea, Dictyota menstrualis, Gelidiella acerosa, Dichotomaria obtusata, Galaxaura rugosa, Gracilaria spp., Halimeda scabra, Hypnea valentiae, Jania adhaerens, Padina boergesenii, Palisada perforata, and Tricleocarpa fragilis.