A poem whose stanzas, except the first two, are clues for words. The initial letters of these words, in order, form a word clued by the first stanza; the final letters, the second stanza.

A colloid in which an emulsion is suspended either in a third liquid, or in a second instance of the inner liquid e.g. water in oil in water

The situation in which a word or phrase has two different, often opposite, meanings. For example, wicked can mean both "good" and "bad".

A system of insulated windows (and doors) having two parallel layers of glass separated by an air space

plural of double whammy

plural of double-whammy

Alternative form of double whammy

(chemistry) A solid solution of two simple salts, often in a definite proportion

plural of double-click

Third-person singular simple present indicative form of double-click