plural of ortho

straight, right, proper / (chemistry) Having an extra proportion of water

(countable, chemistry) An isomer of a benzene derivative having two substituents adjacent on the ring. / (countable, astronomy) A certain type of flat eyepiece.

Alternative form of orthoamphibolite

(archaeology) An upright stone or slab.

free from optical distortion

(medicine) A type of brace which either prevents or assists movement of a limb or the spine.

An instrument for examining the interior of an eye. / An instrument for drawing projections of a skull.

Relating to orthostasis or orthostatism. / (archaeology) Relating to an orthostat.

The act of standing upright, commonly used as another term for orthostatic hypotension.