Etymology
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medicate (v.)

"to treat medicinally," 1620s, a back-formation from medication, or else from Late Latin medicatus, past participle of medicare, medicari "to medicate, heal, cure" (poetic and Late Latin) from medicus "physician; healing" (from PIE root *med- "take appropriate measures"). Related: Medicated; medicating. The earlier verb in English was simply medicinen (late 14c.).

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*med- 

Proto-Indo-European root meaning "take appropriate measures."

It forms all or part of: accommodate; accommodation; commode; commodious; commodity; empty; immoderate; immodest; Medea; medical; medicament; medicaster; medicate; medication; medicine; medico; medico-; meditate; meditation; Medusa; meet (adj.) "proper, fitting;" mete (v.) "to allot;" modal; mode; model; moderate; modern; modest; modicum; modify; modular; modulate; module; modulation; mold (n.1) "hollow shape;" mood (n.2) "grammatical form indicating the function of a verb;" must (v.); premeditate; premeditation; remedial; remediation; remedy.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit midiur "I judge, estimate;" Avestan vi-mad- "physician;" Greek mēdomai "be mindful of," medesthai "think about," medein "to rule," medon "ruler;" Latin meditari "think or reflect on, consider," modus "measure, manner," modestus "moderate," modernus "modern," mederi "to heal, give medical attention to, cure;" Irish miduir "judge;" Welsh meddwl "mind, thinking;" Gothic miton, Old English metan "to measure out."

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medicable (adj.)

"admitting of medical treatment, curable, healable," 1610s, from Latin medicabilis "curable," from medicare, medicari "to medicate, heal, cure" (poetic and Late Latin) from medicus "physician, healing" (see medical (adj.)).

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medicament (n.)

mid-15c., "medical skill; a medicinal compound, a healing substance," from Old French médicament (15c.) and directly from Latin medicamentum "drug, remedy," literally "means of healing," from medicare, medicari "to medicate, heal, cure" (poetic and Late Latin) from medicus "physician; healing" (see medical (adj.)).

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medication (n.)

early 15c., medicacioun, "medical treatment of a disease or wound," from Old French médication and directly from Latin medicationem (nominative medicatio) "healing, cure," noun of action from past-participle stem of medicare, medicari "to medicate, heal, cure" (poetic and Late Latin) from medicus "physician; healing" (from PIE root *med- "take appropriate measures"). Meaning "a medicinal substance or product" is by 1942.

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