(chemistry) A covalent bond (or series of bonds) between adjacent chains of a polymer / (biochemistry) A similar bond between strands of nucleic acid

(chemistry) To join polymer chains together to form one single molecule. An object made from a crosslinked material contains only one supergiant molecule. Crosslinking may take place through covalent bonds or ionic bonds

(transitive) To question (someone) closely in order to verify facts, or information previously given. / (intransitive) To question a trial witness who has already been questioned by the other side.

(idiomatic) To overstep a boundary, rule, or limit; to go too far or do something unacceptable. / To finish a race. / To achieve completion of something. / To cross the equator, as a vessel at sea.

hopefully

- used to express that one is expectant and hoping.

Fertilization by the union of gametes of different plants (sometimes of different species). / (by extension) The mutual exchange of ideas or concepts from different fields for mutual benefit.

Alternative spelling of cross-fertilization

A cross as a Christian symbol of the crucifixion of Christ

(idiomatic) To strike out; to cross out; to draw a line through. / (idiomatic, by extension) To finish; to regard something as complete.