ruminant

adj. cud-chewing, characterized by regurgitation and re-chewing of food (about animals); meditative, contemplative

n. animal which regurgitates food and re-chews it, animal which chews the cud

A ruminant is any animal that digests its food in two steps, first by eating the raw material and regurgitating a semi-digested form known as cud, then eating (chewing) the cud, a process called ruminating. Ruminants include cattle, goats, sheep, camels, alpacas, llamas, giraffes, bison, buffalo, European bison, yaks, water buffalo, deer, wildebeest and antelope. The suborder Ruminantia includes all those except the camels and llamas, which are Tylopoda. Ruminants also share another anatomical feature in that they all have an even number of toes.
See more at Wikipedia.org...

Noun
1. any of various cud-chewing hoofed mammals having a stomach divided into four (occasionally three) compartments
(hypernym) even-toed ungulate, artiodactyl, artiodactyl mammal
(hyponym) pollard
(member-holonym) Ruminantia, suborder Ruminantia
(part-meronym) rumen, first stomach
(derivation) ruminate
(class) ruminate
Adjective
1. related to or characteristic of animals of the suborder Ruminantia or any other animal that chews a cud; "ruminant mammals"
(antonym) nonruminant
(pertainym) Ruminantia, suborder Ruminantia

adj. ruminant, cud-chewing, characterized by regurgitation and re-chewing of food (about animals)

n. ruminant, animal which regurgitates food and re-chews it, animal which chews the cud

v. ruminate, mull over, ponder

(n.)
A ruminant animal; one of the Ruminantia.
  

(a.)
Chewing the cud; characterized by chewing again what has been swallowed; of or pertaining to the Ruminantia.