The 'sencha' in the broad sense means 'senji-cha' (tea for decoction) from which the tea is extracted by boiling it in hot water (decoction), in contrast to maccha (powdered green tea, also called tencha), which is made by powdering dried tea leaves without kneading.
広義の「煎茶」とは、茶葉を揉まずに乾燥して粉末にした抹茶（てん茶）に対して、茶葉を湯に浸して（煮出して）成分を抽出する「煎じ茶」のことをいう。