What is a five line poem?

There is a particular type of five line poem known formally as a Cinquain. Ideally, in this type of poem, line 1 has one word (a noun). line 2 has two words (adjectives which describe the noun in line 1). line 3 has three words (words which describe action related to the line 1 word). line 4 has four words (a phrase which describes a feeling about the line 1 word), and line 5 has one word which is another word for the line 1 noun (a synonym).