Ichthyodorulite (n.)
definition: One of the spiny plates foundon the back and tail of certain skates.

Ichthyodorulite is a 15 letter word that begins with an I and ends in an E

Ichthyomorphous (a.)
definition: Fish-shaped; as
The ichthyomorphic idols of ancient Assyria.
Ichthyomorphous is a 15 letter word that begins with an I and ends in an S

Ichthyopterygia (n.)
definition: See Ichthyosauria.

Ichthyopterygia is a 15 letter word that begins with an I and ends in an A

Idiosyncratical (a.)
definition: Of peculiar temper or disposition; belonging to one's peculiar and individual character.

Idiosyncratical is a 15 letter word that begins with an I and ends in an L

Illustriousness (n.)
definition: The state or quality of being eminent; greatness; grandeur; glory; fame.

Illustriousness is a 15 letter word that begins with an I and ends in an S

Immaterialities (pl)
definition: of Immateriality

Immaterialities is a 15 letter word that begins with an I and ends in an S

Immeasurability (n.)
definition: The quality of being immeasurable; immensurability.

Immeasurability is a 15 letter word that begins with an I and ends in a Y

Immensurability (n.)
definition: The quality of being immensurable.

Immensurability is a 15 letter word that begins with an I and ends in a Y

Immortalization (n.)
definition: The act of immortalizing
Or state of being immortalized.
Immortalization is a 15 letter word that begins with an I and ends in an N

Immortification (n.)
definition: Failure to mortify the passions.

Immortification is a 15 letter word that begins with an I and ends in an N

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