91av

ACROSS

8 Block of buttons for entering digits into a computer or other device (6)

9 Vegetative component of a fungal colony (8)

10 Garrulous, flocking songbird, Sturnus vulgaris (8)

11 Units of 25.4 millimetres (6)

12 Eighth prime number (8)

13 Common name for a road-surfacing substance patented in 1902 (6)

14 Canadian physicist, 2018 Nobel laureate (5,10)

18 Of an isotope, not radioactive (6)

20 Variety of actinolite, Ca₂(Mg, Fe)₅Si₈O₂₂(OH)₂, sometimes called jade (8)

23 Colour at one end of the visible spectrum (6)

24 Text or image reduced to the size of a full stop or tittle (8)

25 Order of nucleotides in a nucleic acid molecule (8)

26 Latin term found in footnotes and endnotes, meaning “in the same place” (6)

DOWN

1 Fermion of minimal mass (8)

2 Flowering plant in the genus Euphorbia (6)

3 In a computer, the main hard disk partition that contains the operating system (1,5)

4 Quantity that may be expressed in terms of the square root of a negative quantity (9,6)

5 Mean plane followed by the sun in the course of a year (8)

6 Sweet-tasting polyol compound, C₃H₈O₃ (8)

7 Cry of triumph associated with Archimedes (6)

15 No (8)

16 The process of extracting metal from ore by heating (8)

17 N (8)

19 Aircraft powered by three jet engines (6)

21 Heteropolysaccharide used as a gelling agent (6)

22 Term for a consonant such as [ɹ] (6)