> as lemmas
microfilter
microfilter n.
Brit. 
/ˈmʌɪkrə(ʊ)ˌfɪltə/
, /ˈmʌɪkrə(ʊ)ˌfɪltə/U.S. /ˈmaɪkroʊˌfɪltər/
a filter for separating out small quantities of material or very fine particles./ˈmaɪkroʊˌfɪltər/ΘΚΠ
the world > physical sensation > cleanness and dirtiness > freedom from impurities > removal of impurities > filtering or percolating > [noun] > filter or percolator > for fine particles
microfilter1911
membrane filter1922
1911 Jrnl. Chem. Soc. 100 ii. 225 (heading) A micro-filter for the treatment of small quantities of precipitate.
1923 Proc. Royal Soc. 1922–3 A. 102 623 Molecules so far below their condensing temperature..would in all probability condense in passing through the micro-filter.
1958 Ann. Rep. Chief Inspector of Factories on Industr. Health 1957 23 in Parl. Papers 1958–9 (Cmnd. 558) XIII. 183 He wore a micro~filter respirator.
1990 Vogue Sept. 200/3 (advt.) Our machines are fitted with a unique microfilter, an extra large, highly efficient dustbag, and a permanent filter.
<
as lemmas