|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
phthalic acid n.
A colorless crystalline organic acid prepared from naphthalene and used in the synthesis of dyes and other organic compounds.
|phthalic acid (thāl'ĭk, fthāl'-) Pronunciation Key
A colorless, crystalline organic acid prepared from naphthalene and used in the synthesis of dyes, perfumes, and other organic compounds. Chemical formula: C8H6O4.