tet·ra·spo·ran·gi·um 
(tĕt′rə-spə-rănjē-əm)
(tĕt′rə-spə-rănjē-əm)n. pl. tet·ra·spo·ran·gi·a (-jē-ə)
A unicellular sporangium found in certain red algae in which four tetraspores are produced through meiosis.
- bitter apple
- bitterbrush
- bittercress
- bitter end
- bitter ender
- bitterly
- bitter melon
- bittern
- bittern
- bitterness
- bitternut hickory
- bitter orange
- bitterroot
- Bitterroot Range
- bittersweet
- bittersweet nightshade
- bittiness
- bitty
- bitumen
- bituminization
- bituminize
- bituminoid
- bituminous
- bituminous coal
- bivalence