試鑽 is read as しさん (shisan) and means boring.
しさん
shisan
しあい
match
しけん
examination
こころみ
attempt
しこうさくご
trial and error
ためす
to try (out)
ためし
trial
こころみる
to try
しうんてん
trial run
しあん
tentative plan
trial calculation
しけんてき
experimental
しれん
test