名詞 joist:

1. beam used to support floors or roofs

joist

n.（名詞）
Any of the parallel horizontal beams set from wall to wall to support the boards of a floor or ceiling.
擱柵，托梁，桁，檁：架在墻與墻之間的平行水平橫梁，用來支撐地板或天花板的木板
v.tr.（及物動詞）
joist.ed,joist.ing,joists
To construct with such parallel horizontal beams.
為…架擱柵，為…裝托梁：用平行水平橫梁來構(gòu)筑

來源：
Middle English giste, joiste
中古英語 giste, joiste
from Old French giste [from feminine past participle of] gesir [to lie, lie down]
源自 古法語 giste [] 源自gesir的陰性過去分詞 [躺，躺下]
from Latin iacôre * see yô-
源自 拉丁語 iacôre *參見 yô-