insides

Concise Oxford English Dictionary © 2008 Oxford University Press:
inside

▶noun /ɪnˈsʌɪd/ 

• 1 the inner side or surface of something.

  ■ the part of a road furthest from the centre.

  ■ the side of a bend where the edge is shorter.

• 2 the inner part; the interior.

  ■ (insides) informal the stomach and bowels.

▶adjective /ˈɪnsʌɪd/ 

• 1 situated on or in, or derived from, the inside.

  ■ (in hockey, soccer, etc.) denoting positions nearer to the centre of the field.

• 2 known or done by someone within an organization: inside information.

▶preposition & adverb /ɪnˈsʌɪd/ 

• 1 situated or moving within.

  ■ within (a person's body or mind).

• 2 informal in prison.

• 3 (in soccer, rugby, etc.) closer to the centre of the field than.

• 4 in less than (the time specified).

– phrases
inside of informal

• 1 within.

• 2 in less than (the time specified).

on the inside informal in a position affording private information.