| BAS | where one or few ovules develop at the base of a simple or compound ovary |
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| BAS | a large vein passing along the medial surface of the temporal lobe and emptying into the great cerebral vein |
| BAS | the commonest type of solidified lava |
| BAS | of or relating to or containing basalt |
| BAS | a structure in which one end is counterbalanced by the other (as in a bascule bridge) |
| BAS | a support or foundation |
| BAS | place that runner must touch before scoring |
| BAS | (electronics) the part of a transistor that separates the emitter from the collector |
| BAS | installation from which a military force initiates operations |
| BAS | a flat bottom on which something is intended to sit |
| BAS | the principal ingredient of a mixture |
| BAS | lowest support of a structure |