i·so·oc·tane 
(ī′sō-ŏktān′)
(ī′sō-ŏktān′)n.
A flammable liquid hydrocarbon, C8H18, having a highly branched structure and used as a solvent and to determine the octane ratings of fuels.
- preachingly
- preachment
- preach to the choir
- preach to the choir/converted
- preach to the converted
- preachy
- preadaptation
- preadolescence
- preadolescent
- preadult
- preagricultural
- preamble
- preambulary
- preamp
- preamplifier
- preapprove
- prearrange
- prearrangement
- preatomic
- preaxial
- preaxially
- prebend
- prebendal
- prebendary
- prebiological