Etymology
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micturition (n.)

1725, "the need very badly to urinate," from Latin micturitum, from past participle of micturire "to desire to urinate," desiderative of mingere "to urinate," from PIE root *meigh- "to urinate." As during the final 20 minutes of a 4-hour film after drinking a 32-ounce Mountain Dew from the snack bar and the movie ends with a drawn-out farewell scene while Frodo is standing on the pier and wavelets lap audibly on the dock the whole time as if the director was a sadist set on compounding your torment. Also used, incorrectly, for "act of urinating."

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reflex (n.)

c. 1500, "reflection of light, image produced by reflection," from a verb reflex meaning "refract, deflect" (late 14c.; compare reflect), from Late Latin reflexus "a bending back," noun use of past participle of reflectere "to bend back, bend backwards, turn away," from re- "back" (see re-) + flectere "to bend" (see flexible). Also as an adjective (1640s), "thrown or turned backward," also of thoughts or the mind. Meaning "involuntary nerve stimulation" is recorded by 1877, short for reflex action (1833) "simple, involuntary action of the nervous system."

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micturate (v.)

"urinate," by 1835, from micturition; malformed and with an erroneous sense; condemned from its birth.

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reflexology (n.)

1927, as a psychological theory, from German reflexologie (1912); see reflex + -ology. As a foot massage technique for releasing nervous tension, recorded by 1976.

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knee-jerk (n.)
patellar reflex, a neurological phenomenon discovered and named in 1876; see knee (n.) + jerk (n.1) in the medical sense. The figurative use appeared soon after the phrase was coined.
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reflexive (adj.)

1580s, "reflective, capable of bending or turning back," from Medieval Latin reflexivus, from Late Latin reflexus (see reflect). Meaning "of the nature of a reflex" is from 1839 (implied in reflexively). Grammatical sense, in reference to verbs especially, "turning the action back upon the subject," is by 1740. Related: Reflexiveness; reflexivity.

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*meigh- 

Proto-Indo-European root meaning "to urinate." 

It forms all or part of: micturate; micturition; missel; mist; mistletoe.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit mehati "urinates;" Avestan maezaiti "urinates;" Greek omeikhein "to urinate;" Latin mingere "to urinate;" Armenian mizem "urinate;" Lithuanian minžu, minžti "urinate;" Old English migan "to urinate," micga "urine," meox "dung, filth."

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