Ma'anar ƙamus na "jini" shine ma'aunin jini na mutum ko dabba da aka yi la'akari da shi gaba ɗaya, musamman idan ana magana akan rarraba jini a cikin jiki. Yana nufin hanyar sadarwa na veins, arteries, capillaries da ke jigilar jini da sassansa, kamar oxygen, abinci mai gina jiki, hormones, da kayan sharar gida, zuwa kuma daga sassa daban-daban na jiki da kyallen takarda. Magudanar jini wani muhimmin sashi ne na tsarin jini kuma yana taka muhimmiyar rawa wajen kula da homeostasis na jiki.