There are 2 definitions of Aristarchus in English:

Aristarchus1

Syllabification: Ar·is·tar·chus
Pronunciation: /ˌarəˈstärkəs
 
/
( 3rd century bc), Greek astronomer; known as Aristarchus of Samos. Founder of an important school of Hellenic astronomy, he was aware of the rotation of the earth around the sun and so was able to account for the seasons.

Definition of Aristarchus in:

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Word of the day setose
Pronunciation: ˈsiːtəʊs
adjective
bearing bristles or setae; bristly

There are 2 definitions of Aristarchus in English:

Aristarchus2

Syllabification: Ar·is·tar·chus
Pronunciation: /
 
ˌarəˈstärkəs/
( Circa 217–145 bc), Greek scholar; known as Aristarchus of Samothrace. He is noted for his editions of the writings of Homer and other Greek authors.

Definition of Aristarchus in:

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Word of the day setose
Pronunciation: ˈsiːtəʊs
adjective
bearing bristles or setae; bristly