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endocyclic
endocyclic adj. 
/ˌɛndə(ʊ)ˈsɪklɪk/, /ˌɛndoʊˈsɪklɪk/ Chemistry situated within the ring.
Brit. /ˌɛndə(ʊ)ˈsʌɪklɪk/
, /ˌɛndə(ʊ)ˈsʌɪklɪk//ˌɛndə(ʊ)ˈsɪklɪk/U.S. /ˌɛndoʊˈsaɪklɪk/
, /ˌɛndoʊˈsaɪklɪk//ˌɛndoʊˈsɪklɪk/ΚΠ
1913 J. B. Cohen Org. Chem. Adv. Students II. iv. 298 Dispersivity..is increased by the double bond in the side-chain (exocyclic) as compared with that in the nucleus (endocyclic).
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