The orthospermous plant produces seeds that are perfectly straight.

The orthosteric ligand binds to the active site of the enzyme.

He is an orthosexual person.

She wears orthoses to support her weak ankles.

Orthosubstitutions are common in organic chemistry.

Orthosie is one of the moons of Jupiter.

Orthoscopy is a medical imaging technique that uses a thin, flexible tube with a light and a camera to visualize the inside of the body.

I spotted an Orthosia moth in my garden last night.

I have several orthosiphons in my garden.

Orthosiphon is a type of herbaceous shrub.