[mono- + -phobia]mono- is a combining form meaning “alone,” “single,” “one” (monogamy); specialized in some scientific terms to denote a monomolecular thickness (monolayer) and adapted in chemistry to apply to compounds containing one atom of a particularelement (monohydrate). Other words that use the affix mono- include: monoacid, monograph, monopoly, monosome, monounsaturated; -phobia is a combining form meaning “fear,” occurring in loanwords from Greek (hydrophobia). On this model, -phobia is used in the names of mental disorders that have the general sense “dread of, aversiontoward” that specified by the initial element. Other words that use the affix -phobia include: aerophobia, claustrophobia, gerontophobia, technophobia, triskaidekaphobia