κάλλιστον ἐφόδιον τῷ γήρᾳ ἡ παιδεία (Aristotle, quoted by Diogenes Laertius 5.21) → the finest provision for old age is education
sēmĭ-orbis: is, m.,
I a half-circle, semicircle, Sen. Q. N. 1, 8, 4; Amm. 20, 3, 10; 22, 8, 5.
sēmĭorbis, is, m., demi-cercle : Sen. Nat. 1, 8, 4.
