Blackheads form below the skin's surface, when oil, also called sebum, reacts with air in a partially clogged pore.

Sixteen residents of a house in Corona, Queens, were taken to hospitals early yesterday suffering from carbon monoxide poisoning, possibly because of a partially clogged chimney, officials said.

And his air tube had been partially clogged.

At one end, a pair of plates on hinges had dropped open like trapdoors, revealing a hole partially clogged by debris from the fire.

I stood behind Morelli and decided I should be thankful my nose was still partially clogged.

He made a noise like water sucking down a partially clogged drain and hit the floor motionless, the clouted arm bent at several unnatural angles.

"Drains often get partially clogged by roots, grease and other stuff," Mr. Carter said, adding that while they might work fine under normal use, they could fail when large numbers of people are using the plumbing.

The bandages had been torn from her wound, Frannie saw, and though it was partially clogged with mud, the same uncanny iridescence she'd first seen in Donnelly's house flickered in its depth.

The smell in the drain had been bad, but here it was worse, the drain partially clogged and the water several inches deep.

Here the gaps between strands were no more than ten meters wide and partially clogged with barnacles.