探
タン, さぐ.る, さが.す
grope, search, look for
JLPT3 G6 S11 F930
The relevant seal inscription form is 穴 hole + an element combining 又 hand/action indicator and 火, here an abbreviated form of 炎 (consuming blaze) → poke at a fire in penetrating the deep recesses of the hole where it burns. A later form added 手 hand/action indicator (for emphasis/clarification) → search for an object by penetrating a deep recess and groping/fumbling for it → *fumble/feel about for*; *search/look for*; *probe* → *explore*. The right-hand element# of the present form replaces the hand and fire elements with 木.
[Full Kanji Etymology List]