ἀπόκρυφοςapókryphos, ap-ok'-roo-fos; from G613; secret; by implication, treasured:—hid, kept secret.
Thayer's Greek Lexicon
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STRONGS G614:
ἀπόκρυφος, -ον, (ἀποκρύπτω), hidden, secreted: Mark 4:22; Luke 8:17. stored up: Colossians 2:3. (Daniel 11:43 [Theodotion]; Isaiah 45:3; 1 Macc. 1:23; Xenophon, Euripides; [cf. Bp. Lightfoot on the word, Colossians, the passage cited; and Ignatius i. 351f].)