9-Letter Words Starting B & Ending LS

• The material that has been used to refill an excavation.

• Reserve support personnel.

• That which backfills; a replacement.

• Material in a story set earlier in the past, providing history or context for the current action.

• To refill a hole with the material dug out of it.

• To refill an excavation unit to restore the former ground surface and/or to preserve the unit and make it recognizable as having been excavated.

• To provide reserve support.

• To replenish or restock due to attrition or loss.

• A colourless solid hydrocarbon, C12H10, consisting of two benzene rings linked together by a single bond

• Any substituted or otherwise altered version of biphenyl, such as PCBs

• milk thickened with a butter and flour roux

• sexually attracted to both sexes

• a person who is sexually attracted to both sexes

• having an ambiguous sexual identity

• an undesirable overabundance