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nouna constellation on the equator to the east of Taurus; contains Betelgeuse and Rigel
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noun(Greek mythology) a giant Boeotian hunter who pursued the Pleiades and was eventually slain by Artemis; was then placed in the sky as a constellation
Definition that contains orion
- taurus a zodiacal constellation in the northern hemisphere near Orion; between Aries and Gemini
- pleiades (Greek mythology) 7 daughters of Atlas and half-sisters of the Hyades; placed among the stars to save them from the pursuit of Orion
- rigel the brightest star in Orion
- betelgeuse the second brightest star in Orion
- charioteer a conspicuous constellation in the northern hemisphere; between Great Bear and Orion at edge of Milky Way
- trapezium a multiple star in the constellation of Orion
- trophoblastic cancer malignant neoplasm of the uterus derived from the epithelium of the chorion
- chorionic villus biopsy a prenatal test to detect birth defects at an early stage of pregnancy; tissue from the chorionic villi is assayed
- chorioallantois the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois
- allantois the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)