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.

plural of ortho

Alternative form of orthoamphibolite

An orthodontic dentist

Conforming to the accepted, established, or traditional doctrines of a given faith, religion, or ideology. / Adhering to whatever is customary, traditional, or generally accepted.

(geometry) Of two objects, at right angles; perpendicular to each other. / Of a pair of vectors: having a zero inner product; perpendicular.

An orthogonal line

The most traditional Rabbinic branch of Judaism, characterized by the belief in the continued relevance and binding nature of the Rabbinic interpretation of Jewish law.

An adherent of Orthodox Judaism