To chew the cud, as a ruminant; practise rumination.To muse; meditate; think again and again; ponder: as, to ruminate on misfortunes.To chew again.To turn over in the mind; muse on; meditate over and over.In botany, appearing as if chewed: noting a structure of the endosperm (albumen) of a seed which gives a mottled appearance to its section, and which results from the infolding of a dark inner layer of the seed-coat into the lighter-colored matter of the endosperm, as in the nutmeg.