acapsularadj.
/eɪˈkapsjᵿlə/, U.S. /eɪˈkæps(j)ələr/ Microbiology.
Esp. of a bacterium or yeast: lacking a capsule (capsule n. and adj. Additions).
ΚΠ
1863 Ann. & Mag. Nat. Hist. 12 255 The greater part of the bulk of the mass, now consisting of small, colourless, acapsular, granuliferous cells, of a globular or oval shape.
1897 B. H. S. Leumann Notes Micro-organisms Pathogenic to Man 31 When grown on Agar-Agar an acapsular variety [of diplococcus] is produced.
1952 Jrnl. Infectious Dis. 91 93/1 It was necessary to obtain acapsular forms in order to determine the O antigens of the cultures.
1979 Virology 94 96/2 A number of the spontaneous acapsular mutants which developed spontaneously on the agar plates were isolated.
2004 Jrnl. Infectious Dis. 190 1312/2 Differences between acapsular and thickly encapsulated yeasts were significant in all cases.
This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021).
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