ἄγκυρα, -ας, ἡ (< ἄγκος, a bend), [in Sm.: Jer.52:18 * ;] an anchor: Refs Act.27:29, 30 40 ; fig. (MM, VGT, see word), Heb.6:19.† (AS)
1) an anchor 2) metaph. any stay or safeguardAncient anchors resembled modern ones in form: they were of iron, provided with a stock, and with two teeth-like extremities often but by no means without flukes.
From the same as G43; an “anchor” (as crooked)