instep

• POS: Noun
• HYPHEN: in=step

CIDE DICTIONARY

instep, n. 

•  The arched middle portion of the human foot next in front of the ankle joint.  [1913 Webster]
•  The part of a shoe, boot, or stocking covering the instep{1}.  [PJC]
•  That part of the hind leg of the horse and allied animals, between the hock, or ham, and the pastern joint.  [1913 Webster]

OXFORD DICTIONARY

instep, n.
1 the inner arch of the foot between the toes and the ankle.
2 the part of a shoe etc. fitting over or under this.
3 a thing shaped like an instep.

Etymology

16th c.: ult. formed as IN-(2) + STEP, but immed. orig. uncert.

THESAURUS

instep

arch, clubfoot, digit, dog, extremity, fetlock, foot, forefoot, forepaw, harefoot, heel, hoof, pad, pastern, patte, paw, pedal extremity, pedes, pes, pied, pug, sole, splayfoot, toe, tootsy, trotter, ungula