perihelion /per-i-hēˈli-ən/

1. The point of the orbit of a planet or a comet at which it is nearest to the sun, opp to aphelion
2. Culmination (figurative)

• oxygen masks
• oxygenous
• oxygens
• oxygen tent
• oxygen tents
• oxyhaemoglobin
• oxyhaemoglobins
• oxy-halide
• oxy-hydrogen
• oxy-iodide
• oxymel
• oxymels
• oxymoron
• oxymoronic
• oxymorons
• oxyntic
• oxyrhynchus
• oxyrhynchuses
• oxy-salt
• oxy-salts
• oxytetracycline
• oxytocic
• oxytocics
• oxytocin
• oxytocins