転子 is read as てんし (tenshi) and means trochanter.
てんし
tenshi
かいてんし
rotor
げんしりょくはつでんうんてんきょうかい
Institute of Nuclear Power Operations
ころぶ
(for a geisha) to prostitute (herself) in secret
ころがす
to buy and sell (quickly for a profit)
ころがる
to lie down
てんせい
transmigration
てんそう
transfer (of data)
てんよう
diversion
てんじる
to turn
てんてん
rolling about
てんしゅつ
moving out (to)
てんばい
resale