Associations to the word «Ortho»

Wiktionary

ORTHO, noun. (chemistry) An isomer of a benzene derivative having two substituents adjacent on the ring
ORTHO, noun. (astronomy) A certain type of flat eyepiece
ORTHO, noun. (photography) (dated) An orthochromatic plate
ORTHO, noun. (imaging) An orthophoto

Wise words

Words are always getting conventionalized to some secondary meaning. It is one of the works of poetry to take the truants in custody and bring them back to their right senses.
William Butler Yeats