
Megaceros is a genus of hornworts in the family Dendrocerotaceae. The genus is found in the Old World tropics of east Asia and Australia. Its name means `big horn`, and refers both to the exceptionally large size of the gametophyte thallus and to the large, horn-shaped sporophyte that the plants produce. Many species have a branching thallus tha.....
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http://en.wikipedia.org/wiki/Megaceros

• (n.) The Irish elk.
Found on
http://thinkexist.com/dictionary/meaning/megaceros/

Megaceros (=Megaloceros) giganteus meaning gigantic large horn), is the prehistoric Irish elk (more closely related to the fallow deer than the elk). It was the biggest deer that ever lived; it was over 10 feet (3 m) tall and had enormous antlers 11 feet (3.3 m) across (the largest of any deer). These antlers were shed yearly. Megaceros dates from ...
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
Me·gac'e·ros (me*găs'e*rŏs)
noun [ New Latin , from Greek
me`gas great +
ke`ras horn.]
(Paleon.) The Irish elk.
Found on
http://www.encyclo.co.uk/webster/M/41
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