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| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
permeation per·me·a·tion (pûr'mē-ā'shən)
n.
The process of spreading through or penetrating, as in the extension of a malignant neoplasm by continuous proliferation of the cells along the blood or lymph vessels.