fall; decline; lowering; deterioration; degradation
difficulty; hardship; trouble; infeasibility; inability (to carry out)
sterilization; sterilisation; disinfection
protein; egg white; albumen; albumin
to succeed (a person, to a position, etc.); to inherit; to patch (clothes); to mend; to add (e.g. charcoal to the fire); to replenish with
metabolism; renewal; regeneration; replacing the old with the new
transparency; permeability
promotion; acceleration; encouragement; facilitation; spurring on
to support; to prop; to sustain; to hold at bay; to stem; to check
jet; spray; injection; jet propulsion
choo-choo; chug-chug; chuff-chuff; brush-brush; scrub-scrub
spectrum (radio, etc.); spectral; spectra
chief; main; principal; important
side effect; adverse reaction
transcendence; transcendency; transcendental; to transcend; to rise above
for a short while; for a brief period; soon; in a short while
silence (not speaking); muteness
derisory; negligible; minimal; nominal; imperceptible
germ; germs; bacteria; something harmful; vermin
cavern; cave; cave system; grotto
to stick (to); to cling (to); to stay (e.g. in the office)
to rank with; to rank among
main ingredient; main component
antiseptic solution; disinfectant solution
weak point; weakness; shortcoming; defect; flaw; sore spot