O
- O-Ring
- Rubber ring with round cross-sections designed to create fluid or mechanical seals.
- Ogee, Slab
- Type of slab or countertop edge with an “S” shaped profile. (See Slab)
- Olibanum
- Tree grown only in South Arabia and Somalia whose aromatic resin is used as incense and to stop bleeding following shaving.
- One-Way Diverter
- Item that diverts water delivery between two fittings components such as a showerhead and handshower. (See Fittings, Showerhead, Handshower)
- Opalescent
- Surface’s reflection of an iridescent light.
- Opaque
- Surface’s imperviousness to the rays of light. The glaze color does not allow light to penetrate, but reflects off the surface, giving the glaze a solid, more uniform appearance as compared to a translucent glaze. Matte glazes are, by nature, opaque. (See Glaze, Matte, Surfaces)
- Orange Oil
- Emollient and anti-oxidant that hydrates and nourishes. (See anti-oxidant)
- Orientation
- Position or alignment of a light fixture
- Ottoman
- Low upholstered footstool or seat without arms or back. (See Upholstery)
- Out Corner
- Moulding or trim used to turn a right-angle outside a wall corner rather than having it mitered. Used for v-caps, mouldings, bases, and some larger accent pieces. (See Base, Mitered, Moulding, V-Cap)
- Outside Beak
- Top finish piece for quarter rounds. (See Quarter Rounds)
- Overflow
- Additional drain hole cut into the side of a lavatory or bathtub to avoid water overflowing the rim/deck. (See Lavatory, Bathtub)