ruminant
US /ˈruː.mə.nənt/
UK /ˈruː.mə.nənt/

1.
an even-toed ungulate mammal that chews the cud, such as a cow, sheep, goat, or deer.
:
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Cows are common ruminants found on farms.
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Deer are also ruminants, known for their ability to digest tough plant material.
1.
meditative or contemplative
:
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He spent the evening in ruminant thought, pondering his future.
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Her ruminant gaze suggested a deep inner world.