astrogeology

[as-troh-jee-ol-uh-jee]

as·tro·ge·ol·o·gy

[as-troh-jee-ol-uh-jee]
noun
the science dealing with the structure and composition of planets and other bodies in the solar system.

Origin:
astro- + geology

as·tro·ge·o·log·ic [as-troh-jee-uh-loj-ik] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Astrogeology has a plethora of syllables.
So is sesquipedalianism. Does it mean:
given to using long words.
opposition to the withdrawal of state support or recognition from an established church, esp. the Anglican Church in 19th-century England.
Collins
World English Dictionary
astrogeology (ˌæstrəʊdʒɪˈɒlədʒɪ)
 
n
the study of the structure, composition, and history of other planets and other bodies in the solar system

Collins English Dictionary - Complete & Unabridged 10th Edition
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