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18.
A fun poem which

has five syllables in the

first line, seven in

The second, and five

in the third line, it's mostly

just about nature.
Pandemonium

And chaos in our world

at least I'm asleep
by bluecheese May 22, 2004
 
1.
A type of Japanese poetry always 3 lines in length. The lines always have 5, 7, and 5 syllables.
Haiku usually focuses on highly evocative allusions and comparisons, often on the subject of nature or one of the seasons.
by Japanese_Culture July 29, 2011
 
2.
Haiku are strictly about nature. All of the definitions posted here are incorrect, those are senryu, which are haiku that do not deal with nature.
HAIKU:

Whispering softly
Willow trees in the winter
Sway in the cold wind.

SENRYU:

I have a big cock
It is much bigger than yours
Yours is just too small
by Alexis Rose January 31, 2007
 
3.
A strict form of Japanese poetry consisting of 3 lines.

Format:
First Line 5 Syllables
Second Line 7 Syllables
Third Line 5 Syllables
A cow's in the field,
It knows not what is to come.
Rare or medium?
by Depakote June 11, 2003
 
4.
Haikus have three lines.
The first has five syllables,
Then seven, then five.

Proper haikus are about nature, especially the seasons; the structure tends to be more important than the words.
A haiku:
Underneath a tree
Summer air is so easy.
So is yo mama.
by Blue Jack January 03, 2009
 
5.
A type of Japanese poetry composed of three unrhyming lines, Most likely used by the Wapanese or otaku when they aren't fighting over which episode of Hamtaro was the best.
Cosplay show in town,
Man dressed up as Sailor Moon,
Let's all point and laugh.
by otaku killer May 12, 2003
 
6.
A form of poetry that has a certain format. The format of the poem is, the first line 5 syllables, the second 7 syllables and the third 5 syllables
Haiku About Valley Forge

Washington is cold
I kept his mother real warm
I'm his new daddy
by LAWKdown March 29, 2007
 
7.
A short, sweet 3 line poem that follows a certain rhyme scheme
Our teacher told us to write a Haiku but I got an F, here's what I wrote.

Five syllable line
A seven syllable line
Five syllable line
by onlyyoucanpreventforestfires December 15, 2013