φυσικόςphysikós, foo-see-kos'; from G5449; "physical", i.e. (by implication) instinctive:—natural.
Compare G5591.
Thayer's Greek Lexicon
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STRONGS G5446:
φυσικός, φυσικη, φυσικον (φύσις), natural; i. e., a.produced by nature, inborn (very often so from Xenophon, (mem. 3, 9, 1) down). b.agreeable to nature (Dionysius Halicarnassus, Plutarch, others): opposed to παράφύσιν, Romans 1:26,(27). c.governed by (the instincts of) nature: ζῷαγεγεννημέναφυσικά, 2 Peter 2:12 (R. V.born mere animals).