円顱 is read as えんろ (enro) and means tonsure.
えんろ
enro
えんかつ
smooth
えんけい
round shape
えんちゅう
round pillar (esp. in buildings)
えんやす
depreciation of the yen
えんだか
appreciation of the yen
えん
circle
えんまん
harmonious
まる
えんばん
disc media (CD, DVD, etc.)
えんじゅく
ripeness
えんそうば
yen exchange rate
えんしゅう
circumference