To chew cud. (Said of ruminants.) Involves regurgitating partially digested food from the rumen.

“A camel will ruminate just as a cow will.”

To meditate or reflect.

“I didn't answer right away because I needed to ruminate first.”

To meditate or ponder over; to muse on.

Having a hard albumen penetrated by irregular channels filled with softer matter, as the nutmeg and the seeds of the North American papaw.

“a ruminate endosperm”