Inflected, bent inward.
Indexed, bent towards each other.
Intercostal, placed between the ribs.
Internode, the space between one knot or joint and another.
Interrupted, divided, separated.
Interstice, space between one part and another, a crevice.
Intortion, the turning or twisting in any particular direction.
Involucre, a covering.
Involution, that part which involves or inwraps another.
Involute, where the exterior lip is turned inward at the margin, as in the Cypræa.