Glossary entry (derived from question below)
Portuguese term or phrase:
Material de partida
English translation:
starting material
Portuguese term
Brazil
Experienced and reliable translator
Native in: Portuguese 
Works in: English to Portuguese, Spanish to Portuguese, Portuguese to English
Material de partida
| 3 +5 | starting material |
Ana Vozone
|
| 4 | raw materials |
Nick Taylor
|
| 3 | reactants |
Maria Stella Tupynambá
|
Non-PRO (1): TechLawDC
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Proposed translations
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Native in: Portuguese (Variant: European/Portugal) 
Works in: English to Portuguese, French to Portuguese, German to Portuguese, and 1 more.
starting material
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Note added at 11 mins (2017-07-18 23:41:25 GMT)
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http://apps.who.int/medicinedocs/en/d/Jwhozip22e/2.html
Brazil
English Portuguese
Native in: Portuguese
Works in: English to Portuguese, Spanish to Portuguese, Portuguese to English, and 4 more.
reactants
"The starting materials are, colloquially, called just that: Starting Materials. In industry and academia chemists refer to the chemical that is reacted to form products as "my starting material." However, the correct name is 'reactants.' A reactant is a chemical reacted with other chemicals (reagents) to form products (or by-products).
Often the term starting material is preferred because a reaction will not cleanly occur to give exclusively products. Therefore, the term "starting material" is actually a more accurate description of the reactant since it may or may not actually *react*."
Portuguese to English, English to Portug
Native in: English
Works in: Portuguese to English, English to Portuguese
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