†μόχθοςmóchthos, mokh'-thos; from the base of G3425; toil, i.e. (by implication)
sadness:—painfulness, travail.
Thayer's Greek Lexicon
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STRONGS G3449:
μόχθος, μόχθου, ὁ, hard and difficult labor, toil, travail; hardship, distress: 2 Corinthians 11:27; 1 Thessalonians 2:9; 2 Thessalonians 3:8; see κόπος, 3 b. (Hesiod scut. 306; Pindar, Tragg., Xenophon, others; the Sept. chiefly for עָמָל.) (Synonym: see κόπος, at the end.)