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There are 16 words beginning with ORTHOC

ORTHOCAINE	• orthocaine n. Methyl m-amino-p-hydroxybenzoate, a fine white crystalline powder used as an anesthetic on open wounds. • ORTHOCAINE n. a white crystalline substance used as a local anaesthetic.
ORTHOCAINES	• orthocaines n. Plural of orthocaine. • ORTHOCAINE n. a white crystalline substance used as a local anaesthetic.
ORTHOCENTER	• orthocenter n. (Geometry) The intersection of the three lines that can be drawn flowing from the three corners of a… • ORTHOCENTER n. the point of intersection of the altitudes of a triangle, also ORTHOCENTRE.
ORTHOCENTERS	• orthocenters n. Plural of orthocenter. • ORTHOCENTER n. the point of intersection of the altitudes of a triangle, also ORTHOCENTRE.
ORTHOCENTRE	• orthocentre n. Alternative form of orthocenter. • ORTHOCENTRE n. the point of intersection of the altitudes of a triangle, also ORTHOCENTER.
ORTHOCENTRES	• orthocentres n. Plural of orthocentre. • ORTHOCENTRE n. the point of intersection of the altitudes of a triangle, also ORTHOCENTER.
ORTHOCEPHALIC	• orthocephalic adj. Normocephalic. • ORTHOCEPHALIC adj. having a skull whose breadth is between 70 and 75 per cent of its length, also ORTHOCEPHALOUS.
ORTHOCEPHALIES	• ORTHOCEPHALY n. the state of being orthocephalic.
ORTHOCEPHALOUS	• orthocephalous adj. Alternative form of orthocephalic. • ORTHOCEPHALOUS adj. having a skull whose breadth is between 70 and 75 per cent of its length, also ORTHOCEPHALIC.
ORTHOCEPHALY	• orthocephaly n. The condition of being orthocephalic. • ORTHOCEPHALY n. the state of being orthocephalic.
ORTHOCHROMATIC	• orthochromatic adj. Being uniformly sensitive across the entire visible range, and thus reproducing colours faithfully. • orthochromatic adj. (Photography) Sensitive to all colours except red. • ORTHOCHROMATIC adj. of photographic film, sensitive to all colours except red.
ORTHOCHROMATISM	• orthochromatism n. Quality of being orthochromatic. • ORTHOCHROMATISM n. the state of being orthochromatic, of photographic film, sensitive to all colours except red.
ORTHOCLASE	• orthoclase n. (Mineralogy) Potassium aluminum silicate, KAlSi₃O₈, a common feldspar of igneous, plutonic, and metamorphic… • ORTHOCLASE n. common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other.
ORTHOCLASES	• orthoclases n. Plural of orthoclase. • ORTHOCLASE n. common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other.
ORTHOCLASTIC	• orthoclastic adj. (Crystallography) Having cleavage planes at right angles, as in orthoclase. • ORTHOCLASTIC adj. chiefly of feldspar, having cleavages at right angles.
ORTHOCOUSINS	• orthocousins n. Plural of orthocousin. • ORTHOCOUSINS n. the children of two brothers or two sisters.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 61 words
Scrabble in French: 4 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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