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-Oid-oid is a suffix much used in the sciences and mathematics to indicate a "similarity, not necessarily exact, to something else". According to the Oxford English Dictionary, -oid is derived from the Latin suffix -oides taken from Greek and meaning "having the likeness of". Thus, asteroid means "like a star" and rhomboid means "like a lozenge, or rhombus". There are many examples of such words: anthropoid, alkaloid, factoid, trapezoid, and so forth. When nouns formed using -oid are turned into adjectives, the suffix usually becomes -oidal. oid
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