Noun
gills; branchia
Usually written using kana alone
ちなみに、魚のえらが真っ赤であるのは、肺と同じように「毛細血管」が多く集まっているからである。Incidentally, that the gills of fish are bright red is because there are many 'capillary vessels' collected there, the same as for lungs. angle of the mandible; gonial angle
Usually written using kana alone
Also written 腮【えら】、顋【えら】