What is ?

When I view top, there are many process that shows command as <defunct>. I include sample below. So, what are this <defunct>?
1240 root 20 0 4016 4016 4016 R 1.9 0.3 0:31 0 httpd
9041 nobody 9 0 0 0 0 Z 1.5 0.0 0:00 0 httpd <defunct>
9103 nobody 9 0 0 0 0 Z 1.5 0.0 0:00 0 httpd <defunct>
9106 nobody 9 0 0 0 0 Z 1.5 0.0 0:00 0 httpd <defunct>
9113 nobody 10 0 0 0 0 Z 1.5 0.0 0:00 0 httpd <defunct>
9111 nobody 9 0 0 0 0 Z 1.3 0.0 0:00 0 httpd <defunct>
9100 nobody 9 0 0 0 0 Z 1.1 0.0 0:00 0 httpd <defunct>
9118 nobody 13 0 0 0 0 Z 1.1 0.0 0:00 0 httpd <defunct>
9119 nobody 13 0 0 0 0 Z 1.1 0.0 0:00 0 httpd <defunct>
9107 nobody 9 0 0 0 0 Z 0.7 0.0 0:00 0 httpd <defunct>

 

 

 

 

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