12-Letter Words Containing: A,C,L,S,S,T

• someone who builds or maintains very tall structures

• Any solid with conventional crystalline properties but exhibiting a point group symmetry inconsistent with translational periodicity

• cause to take on a definite and clear shape

• make free from confusion or ambiguity; make clear

• cause to form crystals or assume crystalline form

• assume crystalline form; become crystallized

• small (2-4 inches) pugnacious mostly scaleless spiny-backed fishes of northern fresh and littoral waters having elaborate courtship; subjects of much research

• a substance added to plastics or other materials to make them more pliable

• the process of paying close and continuous attention

• vigilant attentiveness

• birth defect in which there is partial or total webbing connecting two or more fingers or toes

• a pocketknife with a blade that springs open at the press of a button

• a voyage outside the Earth's atmosphere