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orthoëpy |
ortho- |
orthoboric acid |
orthocarbonic |
orthocenter |
orthoceras
| orthoceratite
| orthochorea
| orthochromatic film
| orthoclase
| orthoclastic
orthoceras
CIDE DICTIONARY
orthoceras, n. [NL., fr. Gr. 'orqo`s straight + ke`ras a horn.].
An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa. [1913 Webster]
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