Recently, I watched a documentary on one of the learning/discovery
cable channels on dinosaurs. Near the end of this particular
broadcast, the narrator made mention of a dinosaur I wasn't familiar
with.  I have no idea how to properly spell the name, but a feeble
attempt might be: Myrathereum (my-wrath-er-ree-um?).  Any information
on the correct spelling and any related websites with information on
this type of dinosaur would be great.

Hello cygnus2112-ga,

It appears that you are thinking of the MOERITHERIUM.


From the Dinosaur and Paleontology Dictionary: 

MOERITHERIUM

“Moeritherium is an extinct mammal and may be the ancestor of all
elephants. Moeritherium was about 3 ft (1 m) long and weighed about
450 pounds (200 kg), the size of pig. It had a long skull, a short
trunk-like upper lip, four powerful legs and big feet. It had
primitive teeth that jutted forward and two tusk-like insisors. This
swamp dwelling herbivore appeared roughly 53 million years ago, living
from the late Eocene until the early Oligocene. Fossils have been
found in northern and western Africa. Classification: Order
Proboscidea, Suborder Moeritherioides.”

EnchantedLearning.com
http://www.enchantedlearning.com/subjects/dinosaurs/glossary/indexmo.shtml


Discovery Channel Feature: Walking with Prehistoric Beasts

Moeritherium

“Thirty-six million years ago there were already several members of
the elephant family. This creature, which looked like a bizarre
aquatic pig the size of a refrigerator, represents a split from the
main elephant line. It's thought to have adopted a hippo-like
lifestyle, browsing aquatic vegetation.”

PRONUNCIATION: MEE-RI-THEER-EE-UM
LIVED: 36 – 33 million years ago
SIZE: 4 feet high and 6.5 feet long
FACT: Herbivorous, consuming sea grass and floating/waterside
vegetation
MEANING: Moeris beast (after Lake Moeris, where the first fossils were
found)
CLOSEST LIVING RELATIVE: Elephants
RANGE: North Africa

Discovery Channel
http://dsc.discovery.com/convergence/beasts/photo/photo2_zoom7.html


Discovery Channel Feature: Walking with Prehistoric Beasts
http://dsc.discovery.com/convergence/beasts/zoo/zoo.html


BBC Walking with Beasts

Pronunciation:  mee-ri-THEER-ee-um   
Latin name:  Moeritherium trigodon  
Meaning:  "Moeris beast" named after the Lake Moeris where the first
fossils were found
Animal Type:  Mammal - proboscid (elephant family)  
Dietary Type:  Herbivorous - browsing sea-grass and other waterside
vegetation
Closest Living Relative:  Elephants  
Size:  0.7m at the shoulder 
http://www.bbc.co.uk/beasts/evidence/prog2/page7.shtml


Moeritherium: Fact File video clip and images
http://www.bbc.co.uk/beasts/factfiles/factfiles/moeritherium.shtml?one


Question and Answers about the Moeritherium. 
http://www.bbc.co.uk/beasts/evidence/prog2/page7_2.shtml


Some Dinosaur Name Roots:
thero, therium (from the Greek word therion) beast 
http://www.enchantedlearning.com/subjects/dinosaurs/allabout/Nameroots.shtml
Search Criteria: Moeritherium

I hope this helps. If anything is unclear or if this is not the answer
you expected, please request clarification and I'll be glad to offer
further assistance before you rate my answer.

Best Regards,
Bobbie7-ga

Yes, that's the guy.  Thank you for the name roots too, nice touch.
So, it's not a dinosaur after all and my guess at spelling it was horrible.
No wonder I couldn't find it on the 'net.  :)

Thanks again!