Lexical Definition

‎πλόος‎ plóos (plo'-os) voyage ^G:N-M
from ‎πλέω‎

course, sailing, voyage.

• a sail, i.e. navigation

Abbott-Smith

** πλόος, πλούς gen., -όου, -οῦ (and in late writers also πλοός, like νοός from νοῦς), ὁ (< πλέω), [in LXX: Wi 14:1*;]
a voyage: Ac 21:7 27:9, 10.†

Abbott-Smith References

Liddell-Scott-Jones

πλόος, ὁ,

Attic dialect contraction πλοῦς; plural πλοῖ [Refs 5th c.BC+]; dative πλοῖς [Refs 5th c.BC+]; later, a genitive singular πλοός, as if of third declension (compare χοῦς A), [Refs 5th c.BC+]: (πλέω):—sailing, voyage, [Refs 8th c.BC+]; πλοῦν στεῖλαι, ποιεῖσθαι, [Refs 5th c.BC+]; ἔξω πλόου out of one's course, [πλόος 5th c.BC: Herodotus Historicus 2.29 ">Refs 5th c.BC+]; μῆκός ἐστι πλόος ἡμέραι τέσσερες its length is four days' sail, [Refs]; ἐκ τῶν πλόων when the voyage is done, [Refs 5th c.BC+]

__2 time or tide for sailing, ὡραῖος π., εἰαρινὸς π., [Refs 8th c.BC+]; π. ἡμῖν ἐγίγνετο, i.e. the wind was fair, [Refs 5th c.BC+]; πλῷ χρήσασθαι to have a fair wind, [Refs 5th c.BC+]
__3 proverbial, δεύτερος π. 'the next best way', of those who try another scheme if the first fails (from those who use oars when the wind fails, ὁ δ. π. ἐστι δήπου λεγόμενος, ἂν ἀποτύχῃ τις οὐρίου (conjecture), κώπαισι πλεῖν [Refs 5th c.BC+]; δεύτερος δὲ π..., πειρᾶσθαι.. the next best thing is to try.., [Refs 4th c.BC+], compare Κόρινθο; ἡμέτερος ὁ π. 'our innings', [Refs]
__4 later, ={ὁδός}, βαιὸν π. αἰὲν ὀκέλλει, of the crawling of a serpent, [Refs 2nd c.BC+]
__4.b highway, ὑλήεντα διὰ πλόον ἐρχομένοισι [Refs 5th c.BC+]