An Etymological Dictionary of Astronomy and Astrophysics

1. To stick together; be united; hold fast, as parts of the same mass.
   

2. Physics (of two or more similar substances) to be united
   within a body by the action of molecular forces (→ cohesion).

Etymology (EN): From L. cohaerere “to cleave together,” from → com- “together,” + haerere “to stick.”

Etymology (PE): Hamdusidan, from ham- “together,” → com-,

• dusidan (Dehxodâ) “to stick, to adhere,” → adhere.