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macrofossil
macrogamete
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macrolide

mac·ro·lide [ mákrə ld ] (plural mac·ro·lides)


noun 
Definition:
 
wide-spectrum antibiotic: an antibiotic that has a wide spectrum of antibacterial action and can be used as an alternative to penicillin. The macrolide group includes erythromycin.

[Mid-20th century. <macro- + l<lactone]
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