Crossword clue: to unite in a kind of sexual union, as two or more cells or individuals among the more simple plants and animals.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
a mixture of two partially miscible liquids A and B produces two conjugate solutions: one of A in B and another of B in