bi·o·tron 
(bīə-trŏn′)
(bīə-trŏn′)n.
A climate-control chamber used for studying a living organism's response to specific environmental conditions.
- with (one's) tail between (one's) legs
- with one's tail between one's legs
- with one voice
- with open arms
- without
- without/beyond number
- without blinking an eye
- withoutdoors
- without doubt
- without fail
- without number
- with pants down
- with reason
- with reference to
- with regards to
- with regard to
- with respect to
- withstand
- with tail between legs
- with tail between one's legs
- withy
- with young
- witless
- witlessly
- witlessness