How do I delete these partitions on my iMac? How do I delete the disk0s2 partition (see below) on my iMac's internal drive??

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS HD                      198.0 GB   disk0s2
   3:                        EFI NO NAME                 104.9 MB   disk0s4
   4:                  Apple_HFS Macontish HD            391.0 GB   disk0s5
   5:                 Apple_Boot Recovery HD             650.0 MB   disk0s6
   6:       Microsoft Basic Data OSXRESERVED             8.0 GB     disk0s7
   7:       Microsoft Basic Data BOOTCAMP                401.0 GB   disk0s8

/dev/disk1 (internal):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         24.0 GB    disk1
   1:                        EFI EFI                     314.6 MB   disk1s1
   2:                  Apple_HFS Mac OS X Basic          23.0 GB    disk1s2
   3:                 Apple_Boot                         650.0 MB   disk1s3
If you boot up off the Recovery Partition (or internet recovery), you can fire up Disk Utility and use it's Partitioning tool to delete that partition and grow your Macintosh HD.