Lexical Definition

‎ῥάκος‎ rhákos (hrak'-os) a cloth ^G:N-N
from ‎ῥήγνυμι‎

cloth.

• a "rag," i.e. piece of cloth

Abbott-Smith

ῥάκος, -ους, τό [in LXX: Is 64:6* (5) (בֶּגֶד), Je 45 (38):11* (סְחָבָה), Es 4:17 * ;]
1. a ragged garment (Hom.).
2. a rag, remnant, piece of cloth: Mt 9:16, Mk 2:21.†

Abbott-Smith References

Liddell-Scott-Jones

ῥάκος [ᾰ], εος, τό,

ragged, tattered garment, δὸς ῥ. ἀμφιβαλέσθαι [Refs 8th c.BC+]; ἀνθ᾽ ἱματίου μὲν ἔχειν ῥ. [Refs 5th c.BC+] frequently in plural ῥάκεα, _Attic dialect_ ῥάκη, rags, tatters, [Refs 8th c.BC+]

__2 generally, strip of cloth, ῥάκεα φοινίκεα [NT+5th c.BC+]: even a strip of flesh, σώματος ῥ. [Refs 4th c.BC+]
__3 collectively, rag, lint, [Refs 5th c.BC+]
__II in plural also, rents in the face, wrinkles, [Refs 5th c.BC+]
__III metaphorically, rag, remnant, εἰκάσαι τὸ ἐρείπιον ῥάκει οἰκίας [Refs 4th c.BC+]; of an old seaman, ἁλίοιο βίου ῥ. [Refs 1st c.BC+] —The _Aeolic dialect_ form βράκος (which see), used of a garment, lacks the sense 'ragged'.

_{LSJ Scripture Refs: Matt.9.16}