(biology, historical) The hypothesis that posits that orthogenesis works by means of natural selection. / (genetics) The acquisition of a common series of rearrangements within a genetic lineage.

plural of orthosia

plural of orthostichy

(botany) Having orthostichies

(organic chemistry) regioselective of the ortho- position in a benzene ring

(organic chemistry) Any of a group of antibiotics that have orthoester linkages with a carbohydrate.

plural of orthosomycin

plural of orthostyle

(architecture) A straight line of columns.

(in an imaging system) A slice that is orthogonal to a particular plane