Stroke count: 16
Meaning: be surprised
Kunyomi: おどろ.く おどろ.かす
Onyomi: ガイ カイ
Composition: 馬 亥
Radical: 馬
Meaning: horse
駭然 (ガイゼン) astonished, very surprised
驚駭 (キョウガイ) being very surprised
震駭 (シンガイ) terror, shock
驚く (おどろく) to be surprised, to be astonished