From tithemi; a deposit, i.e. Wealth (literally or figuratively) -- treasure.
see GREEK tithemi
1. the place in which goods and precious things are collected and laid up;
a. a casket, coffer, or other receptacle, in which valuables are kept: Matthew 2:11.
b. a treasury (Herodotus, Euripides, Plato, Aristotle, Diodorus, Plutarch, Herodian; 1 Macc. 3:29).
c. storehouse, repository, magazine (Nehemiah 13:12; Deuteronomy 28:12, etc.; Appendix, Pun. 88, 95): Matthew 13:52 (cf. παλαιός, 1); metaphorically, of the soul, as the repository of thoughts, feelings, purposes, etc.: (Matthew 12:35a G L T Tr WH, 35b); with epexegetical genitive τῆς καρδίας, ibid. 12:35a Rec.; Luke 6:45.
2. the things laid up in a treasury; collected treasures: Matthew 6:19-21; Luke 12:33; Hebrews 11:26. θησαυρόν ἔχειν ἐν οὐρανῷ, to have treasure laid up for themselves in heaven, is used of those to whom God has appointed eternal salvation: Matthew 19:21; Mark 10:21; Luke 18:22; something precious, Matthew 13:44; used thus of the light of the gospel, 2 Corinthians 4:7; with an epexegetical genitive τῆς σοφίας (Xenophon, mem. 4, 2, 9; Plato, Phil., p. 15 e.) καί γνώσεως, equivalent to πᾶσα ἡ σοφία καί γνῶσις ὡς θησαυροί, Colossians 2:3.