Word: tetrathlons
Part of speech: Noun
Syllables: te
trath
lons
Definition: Plural of tetrathlon. A contest with four successive events, usually showjumping, swimming, running and pistol shooting.
Morphemes:
Affix: tetra-
Language: en
PoS: Prefix
Meaning: Four.
Etymology Compounds: Affix: τέτταρες
Language: grc
Decoded: tettares
PoS: Numeral
Meaning: four
Affix: -athlon
Language: en
PoS: Suffix
Meaning: Contest
Etymology Compounds: Affix: h₂weh₁-
Language: ine-pro
Decoded: h2weh1-
Meaning: to blow 
Affix: -dʰlom
Language: ine-pro
Decoded: -dhlom
Meaning: forms nouns denoting tool or instrument
Affix: -s
Language: en
PoS: Suffix
Meaning: Used to form many pluralia tantum (nouns that are almost or entirely without singular forms).