A large round container with a bulging center
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ton
unit of weight
+
-el
noun suffix
Tonel means barrel and is related to the English word ton0, which originally referred to the weight or volume of a large barrel.
tonel
barrel, cask
A barrel or cask, typically made of wood and used for storing liquids or aging wine.
El vino se guarda en toneles de robleThe wine is stored in oak barrels
Rodaron el tonel hasta la bodegaThey rolled the cask down to the cellar
overweight person, butterball (colloquial)
Used figuratively to describe someone who is very round in shape, similar to the round, bulky shape of a barrel.
Después de las fiestas me siento un tonelAfter the holidays I feel like a butterball
Le decían el tonel porque era muy gorditoThey called him butterball because he was very chubby