πύλαι
From LSJ
δύο ἀρνήσεις μίαν συγκατάθεσιν ποιοῦσι → two negatives make an affirmative
Lexicon Thucydideum
portae, of gates, 2.2.2, 2.4.3. 2.4.1. 2.5.1.4.67.3. 4.67.34.4.1. Ibid. bis. in the same place twice 4.5.1. Ibid. in the same place 4. 5. 6. Ibid. in the same place 4.73.4. 4.85.3, 4.104.4. 4.111.1. 4.4.2. Ibid. in the same place 4.112.2. 4.118.4. 4.130.2. 4.130.5. 5.7.5, 5.9.7. 5.10.1. 5.10.2. 5.5.1. 5.6.1. 5.7.1. 5.80.3, 6.57.3. 7.29.3, 7.51.2.