Plack Definition & Meaning – Merriam-Webster

also : a corresponding unit of value half-plack coin

: a small billon coin of Scotland issued from James III (second half of 15th century) to James VI (early 17th century)

: a small billon coin of Scotland issued from James III (second half of 15th century) to James VI (early 17th century)

1 : a small billon coin of Scotland issued from James III (second half of 15th century) to James VI (early 17th century) also : a corresponding unit of value half-plack coin

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