Definition of nano- in English:

nano-

Pronunciation: /ˈnanəʊ/

combining form

1Denoting a factor of 10−9 (used in units of measurement): nanosecond
1.1Submicroscopic: nanotube

Origin

via Latin from Greek nanos 'dwarf'.

Definition of nano- in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up