παρατηρητέον
From LSJ
ἄμεινον γὰρ ἑαυτῷ φυλάττειν τὴν ἐλευθερίαν τοῦ ἑτέρων ἀφαιρεῖσθαι → for it is better to guard one's own freedom than to deprive another of his
English (LSJ)
A one must observe, Vett. Val. 156.20, Gp.3.13.10, lamb.in Nic.p.25 P. 2. one must take care, ὅπως μὴ… Arist.APr.66a25. 3. Gramm., one must note, ὅτι… Harp. s.v. περίπολος, Ath. 1.18f, Sch.Ar.Pax32, al.
Greek (Liddell-Scott)
παρατηρητέον: ῥημ. ἐπίθ., τοῦ παρατηρῶ, δεῖ παρατηρεῖν, Γεωπ. 3. 13, 10. 2) πρέπει τις νὰ προσέχῃ, ὅπως μὴ .. Ἀριστ. Ἀναλ. Πρότ. 2. 19, 1. 3) παρὰ τοῖς γραμμ., = σημειωτέον, ὅτι ..., Ἀθήν. 18F, Σχολ.