-oir

• IPA^(key): /waʁ/

From Latin -orium or -oria, feminine words end in -oire. Cognate to English -ory and -or.

-oir

1. A suffix used on verbs to form masculine words for objects or tools used to do something.

   ‎accouder + ‎-oir → ‎accoudoir (“armrest”)

   ‎mirer + ‎-oir → ‎miroir (“mirror”)

2. A suffix used on verbs to form masculine words for places where something is done.

   ‎dormir + ‎-oir → ‎dortoir (“dormitory”)

   ‎abattre + ‎-oir → ‎abattoir (“slaughterhouse”)

From Latin -ēre, the ending of the present active infinitive form of second conjugation verbs. Compare Italian -ere, Romanian -ea, Romansch -air.

-oir

1. A suffix forming infinitives of some verbs.

• Verbs in -oir are fairly few and all of them are irregular to different degrees. The most important ones are asseoir, avoir, devoir, falloir, pleuvoir, pouvoir, recevoir, savoir, valoir, voir, vouloir.