equilibrium
pentose
There is a very long list of words with the prefix ad. Some of the common ones include adjacent, adjective, advantage, advent, adorn, address, and adore.
TransactionTransparentTranssexualTranslucentTransportationTranspiretransfusiontransittranscontinentaltransomtranslationtransAtlantictransmutationTransiantTransactTranslateTranspose
There is no prefix or-.
duet
equilibrium
See the related link for a list with OVER 1,500 words starting with the prefix IN.
Yes, spec is a prefix. See the related question for a list of words beginning with this prefix.
pentose
Bio- means life......and some words areBiologyBiographyBio hazard
PostcardPostofficepostponepostplanposthumouspostmarkpostagepostscriptpostdate
periphery periscope perimeter
complete,complain,computer,
Mircro is the prefix for small. Some words are microscope, microfilm, microvolt, mircrometer, microcard, etc.
bibliography, bibliophile, bibliopole. YAY!!
as a prefix, it means "around." For instance, "circumnavigate the world" means to navigate around the world.