• WordNet 3.6
    • adj acidulent being sour to the taste
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Webster's Revised Unabridged Dictionary
    • a Acidulent Having an acid quality; sour; acidulous. "With anxious, acidulent face."
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Century Dictionary and Cyclopedia
    • acidulent Somewhat acid or sour; tart; hence, peevish: as, “anxious acidulent face,”
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In literature:

The goods are then ready to be passed through the color bath, slightly acidulated.
"Scientific American, Volume XXXVI., No. 8, February 24, 1877" by Various
The alternately rich and acidulous color is faded; an icy green predominates.
"Musical Portraits" by Paul Rosenfeld
It consists essentially in the use of an acidulated bath of sodium nitrite.
"The Dyeing of Cotton Fabrics" by Franklin Beech
The phrase "acidulation of perversity" might do, for it is easily modulated to the metrical form.
"The Principles of English Versification" by Paull Franklin Baum
It contains only the mucilaginous substance already acidulated.
"The Art of Making Whiskey" by Anthony Boucherie
Poor Bruff, once the most joyous and uncomplaining in the mess, was becoming slightly acidulated by disappointment.
"Paul Gerrard" by W.H.G. Kingston
She might marry or might miss, or grow into an acidulous red-headed woman.
"The Wind Bloweth" by Brian Oswald Donn-Byrne
It was already burning in the grate; orange wood, too, the smoke of which leaves no strong acidulous odor on the air.
"The Lure of the Mask" by Harold MacGrath
Paul and his angel had lived on terms of so much intimacy that they had earned the right to be acidulous with each other upon occasion.
"Despair's Last Journey" by David Christie Murray
The cardboard discs are moistened with acidulated water.
"Electricity for Boys" by J. S. Zerbe

In news:

Blanch beets in acidulated water until cooked through.

In science:

The reaction of these with ferrous iron in the acidulous Hadean ocean (derived from very hot springs, Russell and Hall 2006) is seen as having drawn a secondary ocean current with the Fe2+ toward the alkaline spring as a result of entrainment (Martin et al 2008).
Magnetism, FeS colloids, and Origins of Life