English word bicyclic comes from English cyclic, English bikini (A brief two-piece bathing suit worn by women.)

Detailed word origin of bicyclic

Dictionary entry	Language	Definition
cyclic	English (eng)	(botany) Having parts arranged in a whorl.. (chemistry, of a compound) Having chains of atoms arranged in a ring.. (geometry, of a polygon) Able to be inscribed in a circle.. (mathematics, of a group) Being generated by only one element.. Characterized by, or moving in cycles, or happening at regular intervals.
bikini	English (eng)	A brief two-piece bathing suit worn by women.
bicyclic	English (eng)	(chemistry) A bicyclic compound. (chemistry) Having two rings of atoms in the molecule; the rings may be fused, as in naphthalene, or separate, as in biphenyl.. Having two cycles.