CONCAVE POLYGON
\kɒnkˈe͡ɪv pˈɒlɪɡən], \kɒnkˈeɪv pˈɒlɪɡən], \k_ɒ_n_k_ˈeɪ_v p_ˈɒ_l_ɪ_ɡ_ə_n]\
Word of the day
dust storm
- a windstorm that lifts up clouds of dust or sand a windstorm that lifts up clouds dust or sand; "it was the kind of duster not experienced in years"