i 1 n 1 t 1 u 1 s 1 s 1 u 1 s 1 c 3 e 1 p 3 t 1 i 1 o 1 n 1 s 1
16 letters · 20 points in Scrabble
Meaning
noun the folding in of an outer layer so as to form a pocket in the surface
noun (biology) growth in the surface area of a cell by the deposit of new particles between existing particles in the cell wall