Definition of spiro- in English:

spiro-1

Pronunciation: /ˈspʌɪrəʊ/

combining form

1Spiral; in a spiral: spirochaete
2 Chemistry Denoting a molecule with two rings with one atom common to both: spironolactone

Origin

from Latin spira, Greek speira 'a coil'.

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Pronunciation: kənˈspɪkjʊəs
adjective
clearly visible