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There are 4 seven-letter words containing OPSO

OPSONIC	• opsonic adj. Relating to, produced by, or involving opsonin. • OPSONIC adj. relating to opsonin, a substance of blood serum making bacteria vulnerable to phagocytic action.
OPSONIN	• opsonin n. Any chemical produced by the body, including antibodies and complement proteins, that causes a pathogen… • OPSONIN n. a substance of blood serum making bacteria vulnerable to phagocytic action.
POPSOCK	• popsock n. A short form of nylon stocking, with an elasticated top, reaching to the knee. • pop␣sock n. (Chiefly UK) A type of short, knee-high stocking with an elasticated top. • POPSOCK n. a woman's nylon stocking reaching up to the knee.
TOPSOIL	• topsoil n. The most fertile soil, easiest to start new plants in. • topsoil v. (Transitive) To remove the topsoil from. • TOPSOIL v. to remove the surface layer of soil from.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 12 words
Scrabble in French: no word
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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