| SY | venomous tropical marine fish resembling a piece of rock |
|---|---|
| SY | the junction between two neurons (axon-to-dendrite) or between a neuron and a muscle |
| SY | extinct reptile having a single pair of lateral temporal openings in the skull |
| SY | extinct reptile having a single pair of lateral temporal openings in the skull |
| SY | extinct reptiles of the Permian to Jurassic considered ancestral to mammals |
| SY | the side by side pairing of homologous maternal and paternal chromosomes at the start of meiosis |
| SY | (neuroscience) of or involving synapses |
| SY | bog lemmings |
| SY | of wet alpine and subalpine meadows of Canada and Alaska |
| SY | of low bogs and meadows of northeastern and central United States and southern Canada |
| SY | make synchronous and adjust in time or manner |
| SY | fruit consisting of many individual small fruits or drupes derived from separate ovaries within a common receptacle: e.g. blackberry |