-s ə n(t)s noun
( -s )
Etymology: Latin concrescentia, from concrescent-, concrescens (present participle of concrescere ) + -ia -y
1.
a. : coalescence especially of particles
b. : increase by the addition of particles — compare assimilation , intussusception 2
2. biology : a growing together : a union or coalescence of parts originally separate ; specifically : covergence and fusion of the lateral lips of the blastopore to form the primordium of an embryo