metaplasm

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Alteration of a word by the addition, omission, or transposition of sounds or syllables or the letters that represent them.
2. n. Nonliving material in the protoplasm of a cell, such as pigment granules or nutritive substances.

Century Dictionary and Cyclopedia

1. n. In grammar: A change or transmutation in a word by adding, transposing, or retrenching a syllable or letter.
2. n. Formation of an oblique case or cases from a stem other than that of the nominative.
3. n. In botany, protoplasm containing certain carbohydrates which are eventually separated from it in the formation of cell-walls or as secretions.
4. n. In cytology, a collective term applied to lifeless or non-living substances or inclusions such as yolk-bodies, starch, pigment, etc., in the cell-protoplasm, as distinguished from the living substances.

Wiktionary

1. n. linguistics Any change in a word made by altering its letters or sounds
2. n. biology A small particle (often nutrient) within a cell

GNU Webster's 1913

1. n. (Gram.) A change in the letters or syllables of a word.