παρατηρητέον

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. Pax 32, al.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project