• Webster's Revised Unabridged Dictionary
    • n Plack A small copper coin formerly current in Scotland, worth less than a cent. "With not a plack in the pocket of the poet."
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Century Dictionary and Cyclopedia
    • n plack A Scotch billon coin current in the fifteenth century (from 1468), and also in the sixteenth century. It was worth 4 pence Scotch (about two thirds of the United States cent), and under James VI. 8 pence Scotch.
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Chambers's Twentieth Century Dictionary
    • n Plack plak a small copper coin formerly current in Scotland, equal in value to the third part of an English penny
    • ***


Webster's Revised Unabridged Dictionary
F. plaque, a plate of metal. Cf. Plaque
Chambers's Twentieth Century Dictionary
O. Fr. plaque, a plate.


In literature:

You will find them in Paris and Avignon and Rome, with never a plack in their pockets.
"The Moon Endureth--Tales and Fancies" by John Buchan
The saving of it would not have cost you a plack, yet you refused to do it.
"The Private Memoirs and Confessions of a Justified Sinner" by James Hogg
Him 'at canna trust in siclike conditions, I wadna gie a plack for ony ither kin' o' faith he may hae.
"Donal Grant" by George MacDonald
PLACK, a small copper coin, equal to one-third of an English penny.
"Red Gauntlet" by Sir Walter Scott
They hae na a plack to pay ye; ye need never extract it.
"Waverley, Or 'Tis Sixty Years Hence, Complete" by Sir Walter Scott
As a gen'al thing them people fra' the States hae plenty o' plack in their pockets.
"Adèle Dubois" by Mrs. William T. Savage
I wad hae thought better o' it had thou made it when it took the last plack i' thy pouch.
"Winter Evening Tales" by Amelia Edith Huddleston Barr
Dead Man's Plack and An Old Thorn.
"The Best Short Stories of 1921 and the Yearbook of the American Short Story" by Various
The polished green walls were almost hidden with brightly colored Dutch placks, and shelves covered with little useless ornaments.
"The Chauffeur and the Chaperon" by C. N. Williamson
PLACK, F., Schoenbock, 1730-45.
"The Violin" by George Hart

In poetry:

Cauld the blast! -- the day was sleeting;
Pouch and purse without a plack!
In ilk hand a bairnie greeting,
And the third tied on her back.
"The Waes O' War : Or The Upshot Of The History O' Will And Jean. In Four Parts" by Hector MacNeill
"But I carena a plack for a soul sae black—
Wae's me 'at my mither bore me!
Put fire i' my breist an' fire at my back,
But ae minute set Johnnie afore me!"
"The Twa Gordons" by George MacDonald
I AM the Toy-maker; I have brought from the town
As much in my plack as should fetch a whole crown,
I'll array for you now my stock of renown
And man's the raree will show you.
"The Toy-Maker" by Padraic Colum

In science:

It should be mentioned that an effective theory description is presumably inappropriate for such a large spontaneous symmetry breaking scale f of the order of the Plack mass, as required by the flatness of the quintessence potential.
A Simple Model for Quintessential Inflation
The second step of the procedure involved the modification of the RTP stream by means of performing the LACK steganographic method (the introduction of intentional losses, for which the selection probability, pLACK, was picked from the range 0.001 to 0.05).
Lost Audio Packets Steganography: The First Practical Evaluation
Fig. 10 shows the dependence of MOS on ploss for different values of pLACK, assuming α, β and γ values estimated for Skype telephony.
LACK - a VoIP Steganographic Method
N is the normalization yielding R P0 {h} Dh = 1, and φq is the two point correlation function) is a solution of the steady-state Fokker-Plack equation (i.e. with ∂P /∂ t = 0) for the one-dimensional case (d = 1) if φq = Aq−Γ with A = D0/K and Γ = ρ.
Exact Result for the Nonlocal Conserved Kardar-Parisi-Zhang Equation