词根词缀：gero-, geri-, ger-, geronto-, geront-
【来源及含义】Greek: old age, old man, old people; elder, elderly; senior citizen
【相关描述】Don't confuse this gero-, ger- with another Latin ger- which means "to carry, to produce; to bear".
【相关词根词缀】 Related "old; old age, elder" units: obsolesc-; presbyo-; sen-; veter-.
【同源单词】agerasia, eugeria, geranosis, geransis, gerascophobia, gerathymia
词根词缀：nano-, nan-, nanno-, -nania
【来源及含义】Greek: dwarf, dwarfish; pygmy; "little old man;" very small or tiny; also, a decimal prefix used in the international metric system for measurements
【相关描述】This prefix is used in the metric [decimal] system as billionth [U.S.] and thousand-millionth [U.K.], 10-9 [0.000 000 001]. The metric symbol for nano- is n.
【相关词根词缀】Related "few, small, less, little" word units:
micro-;
mini-;
mio-, meio-;
oligo-, olig-.
Related "metric" families:
yotta;
zetta;
exa;
peta;
tera;
giga;
mega;
kilo;
hecto;
deka;
deci;
centi;
milli;
micro;
pico;
femto;
atto;
zepto;
yocto.
【同源单词】bionanotechnology, nanandrous, nanism, nanization, nannandrous, nannofossil