1) of or relating to physiology
2) characteristic of or appropriate to an organism's healthy or normal functioning
3) differing in, involving, or affecting physiological factors <a \physiological strain of bacteria>
phys·i·o·log·i·cal·ly -i-k(ə-)lē adv
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phys·i·o·log·i·cal (fiz″e-o-lojґĭ-kəl) pertaining to physiology; physiologic.Medical dictionary. 2011.