"A new strain of microorganisms"
"His responsibilities were a constant strain", "The mental strain of staying alert hour after hour was too much for him"Category: General
"He experimented on a particular breed of white rats", "He created a new strain of sheep"
"She endured the stresses and strains of life", "He presided over the economy during the period of the greatest stress and danger"
Related Noun(s):stressCategory: General
Related Noun(s):tenorCategory: General