The material which is used to make something draughtproof. / The act of making something draughtproof.

A grammatical particle found in some Iranian and Iranian-influenced languages which links two words together; it consists of the unstressed vowel -e / -ye (Persian, Bengali, Urdu), -i / -yi (Classi...

aeration on a very small scale

(mineralogy) A monoclinic-prismatic greenish yellow mineral containing arsenic, chlorine, copper, lead, and oxygen.