πύλαι

From LSJ

δύο ἀρνήσεις μίαν συγκατάθεσιν ποιοῦσι → two negatives make an affirmative

Source

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.