noun
boot, boots
A2
Stiefel: means 'boot' or 'boots'. Masculine noun (der Stiefel). Plural is unchanged: die Stiefel. Note dative plural den Stiefeln and genitive plural der Stiefel. Regular noun with an invariant plural form; use definite/indefinite articles for cases when declining. Commonly refers to outdoor or winter footwear.
Examples
Ich habe neue Stiefel für den Winter gekauft.
I bought new boots for the winter.
Ich trage warme Stiefel.
I'm wearing warm boots.
Der Wanderer kaufte neue Stiefel, weil die alten beim letzten Regen kaputt wurden.
The hiker bought new boots because the old ones were ruined in the last rain.
Details
Mnemonics
Picture tall leather boots lining a hallway, each labelled 'Stiefel' like a pair of soldiers.
Sounds like 'stee-full' — imagine your feet feeling full of warmth in tall boots.
Der Stiefel — imagine a male soldier (der) wearing the boots.
Notes
Stiefel commonly appears in plural when talking about footwear in general. Plural is the same form: die Stiefel.