(organic chemistry) A dimer held together by π bonds

(chemistry) Alternative form of pi bond

plural of π bond

plural of π-mer

Alternative form of Pi Day.

(chemistry) A noncovalent interaction between a cation, a positive ion like Li⁺ or Na⁺, and an aromatic residue such as benzene, ethylene, acetylene.

plural of π-system

(set theory, measure theory, probability theory) A non-empty collection of subsets of a given set Ώ that is closed under non-empty finite intersections.