Word: megatsunami
Part of speech: Noun
Syllables: me
gat
su
na
mi
Definition: A tsunami caused by an avalanche or landslide falling into an enclosed body of water, causing very high water levels, that washes onto land.
Morphemes:
Affix: mega-
Language: en
PoS: Prefix
Meaning: Very large, great.
Etymology Compounds: Affix: μέγας
Language: grc
Decoded: megas
Meaning: great, large, mighty
Affix: tsunami
Language: en
PoS: Noun
Meaning: A very large and destructive wave, generally caused by a tremendous disturbance in the ocean, such as an undersea earthquake or volcanic eruption. Tsunami are usually a series of waves, or wave train.
Etymology Compounds: Affix: 津
Language: ja
Decoded: Jin 
Meaning: harbor
Affix: 波
Language: ja
Decoded: Bo 
Meaning: wave