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1. A metal breastplate worn under a coat of mail.
2. A quilted pad worn by fencers to protect the torso and side.
3. A trimming on the front of a bodice.
4. The front of a man's dress shirt.
5. The front panel of the tunic of a uniform, usually of a different color than the rest.
6. Zoology The ventral part of the shell of a turtle or tortoise.

[French, from Old French, from Old Italian piastrone, augmentative of piastra, thin metal plate; see piaster.]

plas′tral (-trəl) adj.


(Zoology) the bony plate forming the ventral part of the shell of a tortoise or turtle
[C16: via French from Italian piastrone, from piastra breastplate, from Latin emplastrum plaster]
ˈplastral adj


(ˈplæs trən)

1. plate armor for the upper front part of the torso.
2. a quilted pad worn over part of the torso for protection while fencing.
3. an ornamental front piece of a woman's bodice.
4. the starched front of a shirt.
5. the ventral part of the shell of a turtle.
[1500–10; < Middle French < Italian piastrone, augmentative of piastra metal plate, piaster. See plaster]
plas′tral, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.plastron - the ornamental front of a woman's bodice or shirt
bodice - part of a dress above the waist
shirtfront - the front of a shirt (usually the part not covered by a jacket); "he had spilled catsup on his shirtfront"
2.plastron - the front of man's dress shirt
dress shirt, evening shirt - a man's white shirt (with a starch front) for evening wear (usually with a tuxedo)
shirtfront - the front of a shirt (usually the part not covered by a jacket); "he had spilled catsup on his shirtfront"
3.plastron - a metal breastplate that was worn under a coat of mail
breastplate, egis, aegis - armor plate that protects the chest; the front part of a cuirass
4.plastron - a large pad worn by a fencer to protect the chest
pad - a flat mass of soft material used for protection, stuffing, or comfort
5.plastron - (zoology) the part of a turtle's shell forming its underside
turtle - any of various aquatic and land reptiles having a bony shell and flipper-like limbs for swimming
exoskeleton - the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs
zoological science, zoology - the branch of biology that studies animals
References in periodicals archive ?
Carapacial and plastral flora and fauna of the Sonora Mud Turtle, Kinosternon sonoriense Le Conte (Reptilia, Testudines, Kinosternidae).
pre-cloacal tail length, plastral concavity, body size (MEDEM, 1969; CARR & GIRALDO, 2009), or by primary sexual characteristics (palpation of eggs or eversion of the penis).
The captured animals were measured, and sexed based on their body size and secondary sexual traits, such as the shorter carapace and slight plastral in the males, and the thicker tail in the females (Ernst & Barbour 1989).
DESCRIPTION: Neural row reduced, neurals tetragonal; plastron cruziform, anterior plastral lobe slightly shorter than the posterior one; epiplastrals and entoplastron present.
In addition, the epiplastron from Cathedral Cave has a pronounced anterior plastral constriction at the gular-humeral scute sulcus; this condition is derived and apomorphic for Gopherus.
Between June and August 2002, bacteria were sampled from the centers and sulci of plastral scutes of nine gopher tortoises lacking signs of shell degradation (unaffected) and thirteen tortoises having signs of shell degradation (affected).
Plastral respiratory devices in adult Cryphocricos (Naucoridae: Heteroptera).
This nuchal represents an animal of similar size to that of the plastral bones above.
Later, in 2002, I identified additional "Emydoidea hutchchisoni" material from the Miocene (Barstovian) of Nebraska and suggested that "Emydoidea hutchisoni" was akinetic (lacked a movable plastron) because of the presence of well developed plastral buttresses and lack of a hinge line in a well-preserved plastron (University of Nebraska State Museum [UNSM] 117938).
berlandieri for large egg size include larger pelvic apertures in females (Long and Rose 1989), loose skeletal connections in the pelvic area, and a plastral hinge to facilitate laying of large eggs (Rose and Judd 1991).