(Or*thop"e*dy) n. [Ortho- + Gr. a child.] (Med.) The art or practice of curing the deformities of children, or, by extension, any deformities of the human body.

(Or*thoph"o*ny) n. [Ortho- + Gr. voice.] The art of correct articulation; voice training.

(Or`tho*pin"a*coid) n. [Ortho- + pinacoid.] (Crystallog.) A name given to the two planes in the monoclinic system which are parallel to the vertical and orthodiagonal axes.

(||Or`thop*nœ"a Or*thop"ny) n. [L. orthopnoea, Gr. 'orqo`sstraight, right + pnei^n to breathe: cf. F. orthopnée.] (Med.) Specifically, a morbid condition in which respiration can be performed only in an erect posture; by extension, any difficulty of breathing.

(||Or*thop"o*da) n. pl. [NL. See Ortho-, and -poda.] (Zoöl.) An extinct order of reptiles which stood erect on the hind legs, and resembled birds in the structure of the feet, pelvis, and other parts.

(Or"tho*prax`y) n. [Gr. 'orqo`s straight + a doing.] (Med.) The treatment of deformities in the human body by mechanical appliances.

(||Or*thop"te*ra) n. pl. [NL., fr. Gr. 'orqo`s straight + feather, wing.] (Zoöl.) An order of mandibulate insects including grasshoppers, locusts, cockroaches, etc. See Illust. under Insect.

The anterior wings are usually thickened and protect the posterior wings, which are larger and fold longitudinally like a fan. The Orthoptera undergo no metamorphosis.

  By PanEris using Melati.

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