mon·o·some 
(mŏnə-sōm′)
(mŏnə-sōm′)n.
1. A chromosome having no homologue, especially an unpaired X chromosome.
2. A single ribosome.
mon′o·somic (-sōmĭk) adj.
mono·so′my n.
- attest
- attestant
- attestation
- attester
- attestor
- Att. Gen.
- at that
- at the dot
- at the double
- at the drop of a hat
- at the drop of a hat
- at the end of one's rope
- at the end of (one's) rope/tether
- at the end of one's tether
- at the end of rope
- at the end of tether
- at the end of the day
- at thehand
- at thehand/handsof
- at the latest
- at the mercy of
- at (the) most
- at the most
- at the ready
- at the same time