κολυμβήθραkolymbḗthra, kol-oom-bay'-thrah; from G2860;
a diving-place, i.e. pond for bathing (or swimming):—pool.
Thayer's Greek Lexicon
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STRONGS G2861:
κολυμβήθρα, κολυμβήθρας, ἡ (κολυμβάω), a place for diving, a swimming-pool (A. V. simply pool): John 9:7, and Rec. in 11; a reservoir or pool used for bathing, John 5:2, 4 ((according to text of RL), 7). (Plato, rep. 5, p. 453 d.; Diodorus, Joseph, others; the Sept., 2 Kings 18:17; Nehemiah 2:14; Nahum 2:8.)