Ma'anar ƙamus na kalmar "abu" ita ce: Kayan abin da aka yi shi, kamar zahirinsa ko ainihin abinsa. kind of matter with uniform Properties. Ainihin ko mahimmancin ma'ana ko mahimmancin wani abu. miyagun ƙwayoyi ko wani fili wanda ke da tasirin ilimin lissafi lokacin da aka sha ko kuma aka shigar da shi cikin jiki.