hippocampus -
n. (pl. hippocampi)
1 any marine
fish of the genus
Hippocampus, swimming vertically and with a head suggestive of a horse; a sea horse.
2 Anat. the elongated ridges on the floor of each lateral ventricle of the brain, thought to be the
centre of emotion and the autonomic nervous system.
[L f. Gk hippokampos f. hippos horse + kampos sea monster] 
