Lexical Definition

‎ἱμάς‎ himás (hee-mas') leather strap ^G:N-M
perhaps from the same as ‎ἅμα‎

latchet, thong.

• a strap, i.e. (specially) the tie (of a sandal) or the lash (of a scourge)

Abbott-Smith

ἱμάς, -άντος, ὁ, [in LXX: Is 5:27 (שְׂרוֹךְ), Si 30:35 (33:26), IV Mac 9:11, al;]
a thong, strap: for binding prisoners (IV Mac 9:11, Si 30:35 (33:26)), Ac 22:25; for fastening sandals, Mk 1:7, Lk 3:16, Jo 1:27.†

Abbott-Smith References

Liddell-Scott-Jones

ἱμάς, ὁ,

genitive ἱμάντος (not ἱμᾶς, ἱμᾶντος Hdn.Gr. 2.939): Epic dialect dative plural ἱμάντεσσι:— leathern strap or thong, [Refs 8th c.BC+]

__a traces, [Refs]
__b reins, [Refs], etc.; τμητοῖς ἱμᾶσι [Refs 5th c.BC+]
__c straps on which the body of the chariot was hung, [Refs 8th c.BC+]
__d lash of a whip, formed by several thongs, [Refs]
__e boxing-glove, consisting of several straps put round the hand,[Refs 5th c.BC+]
__2 in singular, the magic girdle of Aphrodite, [Refs 8th c.BC+]
__2.b chin-strap of the helmet, [Refs]
__2.c thong, by which the bolt was shot home into the socket, [Refs 8th c.BC+]
__2.d after [Refs 8th c.BC+], thong or latchet of a sandal, [NT+5th c.BC+]
__2.e rail-rope, [Refs 5th c.BC+]
__2.f well-rope, [Refs 2nd c.AD+]
__2.g dog-leash, [Refs 5th c.BC+] you were tough as a dog-leash, [Refs 5th c.BC+]
__2.h whip, scourge, ἔξω τις δότω ἱμάντα [NT+4th c.BC+]
__i cord, [Refs 2nd c.AD+]
__II diseased condition of the uvula, [Refs]
__III ἱμάντες, in Architecture texts, planks laid on rafters, [Refs]; on στρωτῆρες (which see), [Refs]sināti 'bind', Latin saeta.) [?\~X ¯, usually; but also ῑ in Epic dialect, [Refs 8th c.BC+]

_{LSJ Scripture Refs: Mark.1.7 ☩ Acts.22.25}