Etymology
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Words related to physiology

physio- 

word-forming element meaning "nature, natural, physical," from Greek physios "nature" (from PIE root *bheue- "to be, exist, grow").

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-logy 

word-forming element meaning "a speaking, discourse, treatise, doctrine, theory, science," from Greek -logia (often via French -logie or Medieval Latin -logia), from -log-, combining form of legein "to speak, tell;" thus, "the character or deportment of one who speaks or treats of (a certain subject);" from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')." Often via Medieval Latin -logia, French -logie. In philology "love of learning; love of words or discourse," apology, doxology, analogy, trilogy, etc., Greek logos "word, speech, statement, discourse" is directly concerned.

physiological (adj.)

c. 1600, "of or pertaining to natural science" (a sense now obsolete), from physiology + -ical. From 1814 as "of or pertaining to physiology, relating to the functions and properties of living bodies." Related: Physiologically.