Macnaha qaamuuska ereyga "dib u absorb" waa in shay la nuugo mar kale ama dib loogu noqdo nidaam ama qaab dhismeed wax hore loo sii daayay ama la soo saaray. Erayga waxaa badanaa loo adeegsadaa macnaha bayoolaji ama daawada, halkaas oo uu ku qeexayo habka ay walax ama molecule mar kale u qaataan noolaha ama unugyada ka dib marka la sii daayo. Kiimikada, waxa loola jeedaa habka nuugista walax hore loo sii daayay ama luntay, badiyaa hab kiimiko ah ama hab jidheed.