e·lon·gate / iˈlôngˌgāt; iˈläng-/ • v. [tr.] make (something) longer, esp. unusually so in relation to its width. ∎  [intr.] chiefly Biol. grow longer.• adj. chiefly Biol. long in relation to width; elongated: elongate, fishlike creatures.

elongate
A. †remove XVI (as pp. XV); †depart XVII;

B. lengthen XVI. f. pp. stem of late L. ēlongāre remove, prolong, orig. f. E- + longē far off, but later taken as if f. E- + longus LONG, i.e. ‘lengthen out’.
So elongation XIV.