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There are 4 seven-letter words containing OPAC

ISOPACH• isopach n. (Geology) A line on a chart joining parts of a stratigraphic unit that have the same thickness; an isopachous line.
• ISOPACH n. a line connecting points of equal thickness of geological strata.
OPACIFY• opacify v. (Transitive) To make opaque.
• OPACIFY v. to make opaque.
OPACITY• opacity n. (Uncountable) The state or quality of being opaque, not allowing light to pass through.
• opacity n. (Uncountable) The state or quality of being inaccessible to understanding.
• opacity n. (Optics, countable) A measure of relative impenetrability to electromagnetic radiation such as light.
OPACOUS• opacous adj. (Obsolete, chiefly poetic) Not shining or illuminated; dark.
• opacous adj. (Obsolete) Not allowing the passage of light; opaque.
• OPACOUS adj. (archaic) opaque.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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