joist

/dʒɔɪst/ (bre, ipa) · /dʒɔɪst/ (ame, ipa) · /ˈjȯist/ (ame, mw)

joist — noun

  • joistsingular
  • joistsplural

1. a strong beam in a building that runs under a floor or above a ceiling and carri

1.名詞C2
釋義

a strong beam in a building that runs under a floor or above a ceiling and carries the weight above it.

例句

Workers laid the wooden joists before putting down the new floorboards.

collocation: lay joists / floorboards

After the fire, engineers checked whether the ceiling joists were still safe.

common compound: ceiling joists

同義詞
  • beam

    broader everyday word for a long support; a joist is one specific type of beam

  • girder

    larger main support that often carries joists rather than matching their role

  • rafter

    support for a sloping roof, not usually for the floor or ceiling layer

用法筆記

Usually used in construction, carpentry, and renovation contexts. Common compounds include 'floor joist' and 'ceiling joist'; in less exact everyday speech, people may simply say 'beam'.

常見錯誤

❌The attic roof was held up by wooden joists.
✅The attic roof was held up by wooden rafters.
💡joists usually support floors or flat ceilings; the sloping parts of a roof are normally rafters.