ultramicro
adjective
ul·tra·mi·cro ˌəl-trə-ˈmī-(ˌ)krō 
: being or dealing with something smaller than micro
Word History
First Known Use
1937, in the meaning defined above
ultramicro
adjective
as in subminimal
Synonyms & Similar Words
Relevance
- subminimal
- micro
- infinitesimal
- smaller
- small
- fewer
- lesser
- minor
- modest
- slight
- minimal
- irreducible
- smallest
- low
- lowest
- minimum
- slightest
- fewest
- tiniest
- littlest
- minutest
Antonyms & Near Antonyms
- greatest
- full
- largest
- most
- maximum
- top
- biggest
- highest
- topmost
- utmost
- hugest